Here's a list of a few Yahoo chat programs and utilities. 

Yahoo Messenger Build 10.0.0.1102 FINAL - (Released 11-12-09)                                         VISTA COMPATIBLE!! NOW OUT OF BETA!!!!!!Looks like they want yahoo messenger to look more like Windows vista.. Its alot different then other versions.. Also runs on new yahoo messenger protocol 17... This is a BRAND new messenger everything is different. Most bugs have been FIXED!! Alot of VIDEO fixes!!Has all kinds of new features!!! New smilieys..Plugin support.. You can now add and talk to your Windows Live AKA MSN MESSENGER BUDDIES!!!!!!If you use a webcam this is the Yahoo version you want!! IF you are on a broadband connection and go on cam ALL VIEWERS get supermode!!!!!1GB file transfers :)This is the version Im using!!lol..,aLL KINDS OF NEW STUFF-- for more info go check out the Yahoo Developers Blog .NO Ytunnel YET FOR THIS VERSION... LOOKS LIKE YAHOO IS UP TO THERE OLD WAYS MAKING A NEW MESSENGER EVERY-OTHER-DAY!!!!!

Yahoo Messenger Build 9.0.0.2162 FINAL - (Released 5-27-09)                                         VISTA COMPATIBLE!! Looks like they want yahoo messenger to look more like Windows vista.. Its alot different then other versions.. Also runs on new yahoo messenger protocol... Most bugs have been FIXED!! Has all kinds of new features!!! New smilieys..Plugin support.. You can now add and talk to your Windows Live AKA MSN MESSENGER BUDDIES!!!!!!If you use a webcam this is the Yahoo version you want!! IF you are on a broadband connection and go on cam ALL VIEWERS get supermode!!!!!1GB file transfers :)aLL KINDS OF NEW STUFF-- for more info go check out the Yahoo Developers Blog .

Yahoo Messenger Multi Login/Ad Banner Remover Plus Ver. 1.0.4.1 - (Released 11-13-09)                    VISTA COMPATIBLE!!This will work with all 8.X, 9.x and 10.x versions of YM, INCLUDING THE NEW BETA 10.0.0.1102!! .. Also includes built in ad killer for chat, webcam and the main YM ad (at the bottom),  This will also allow you to run multiple instances of Yahoo! Messenger!!  instead of only having one open. This is perfect for those who run under several names. This patches the Registry so you are now able to run multiple yahoo messengers!!... This is intended for ALL 8.X, 9.x and 10.x BUILDS OF YAHOO MESSENGER!!!. After Installing Yahoo Messenger, and with yahoo messenger CLOSED!! Run this patch and you will now be able to run as many yahoo messengers as you want!!  Read the Readme.TXT in the Zip for Install Instructions...Special thanks to Tim over at Wackyb for this!!. For Yahoo messenger 8.x, 9.x and up to 10.0.0.542!!!!

Windows Vista No voice chat fix!!  - (Released ?-?-07) Only needed for yahoo messenger versions BEFORE 2009!!!!I have read that anyone that has Windows Vista soon finds out there Yahoo Messenger version 8.1 and 9.0 voice chat doesn't work!! It seems the new vista OS leaves out an IMPORTANT sound codec.. the exact same codec yahoo messenger needs for voice chat!!!  I'm glad its a easy fix just download this file and be sure you have the CURRENT yahoo messenger build up above, then with yahoo messenger closed run the tsp_codec_install.exe..It will install the codec for you..then load up yahoo messenger and BOOM voice chat is back!!!!Thanks to the people at bytescribe.com for releasing a easy fix!!

Yahoo Messenger for MAC 3.0.0 Build 192773 - (Released 9-28-09) Mac is still missing a few things But most of all the fun stuff is there!! This version fixes a bunch of problems including some sign in problems. If you want to read more about this version check out the Yahoo Messenger Blog here--> http://www.ymessengerblog.com/blog/2009/09/28/updated-mac-version-helps-with-sign-in-issues/

Yahoo Messenger Build 8.1.0.421 - (Released 9-5-07) CRITICAL UPDATE!!!! update to this version NOWW there are critical exploits in ALLL versions below this one!!!.HELL YEAAA YAHOO CHAT IS BACK!!! This is a BRAND new messenger everything is different. Most bugs have been FIXED!! Has all kinds of new features!!! Plugin support.. You can now add and talk to your Windows Live AKA MSN MESSENGER BUDDIES!!!!!!(adding MSN messenger buddies is in beta and you have to SIGN UP TO TEST IT!!Go here to sign up and activate it->>> http://messenger.yahoo.com/partners_msn.php ) If you use a webcam this is the Yahoo version you want!! IF you are on a broadband connection and go on cam ALL VIEWERS get supermode!!!!!1GB file transfers :)This is the version Im using!!lol..,They have implemented a new way to login to the chat rooms for more info go check out the Yahoo Developers Blog .Looks Like we have our chat rooms BACK!!! Ytunnel beta 498 is compatible with this version!!! NO MENU UPDATE YET FOR THIS VERSION... LOOKS LIKE YAHOO IS UP TO THERE OLD WAYS MAKING A NEW MESSENGER EVERY-OTHER-DAY!!!!!

Yahoo Messenger 8.0-8.1 Multi Login/Ad Remover 5.4c!!! - (Released 9-5-07) This will work with all 8.x versions of YM. Also includes built in ad killer for chat, webcam and the main YM ad (at the bottom),  This will allow you to run multiple instances of Yahoo! Messenger 8.0 or 8.1!!  instead of only having one open. This is perfect for those who run under several names. This patches the Registry so you are now able to run multiple yahoo messengers!!... This is intended for ALL 8.0 and 8.1 BUILDS OF YAHOO MESSENGER!!!. After Installing Yahoo Messenger, and with yahoo messenger CLOSED!! Run this patch and you will now be able to run as many yahoo messengers as you want!!  Read the Readme.TXT in the Zip for Install Instructions...Special thanks to Tim over at Wackyb for this!!.

XXX Yahoo Smileys for Yahoo Messenger 8.0 and 8.1!!- (Uploaded 5-12-06) Naughty smileys made for Yahoo messenger 6.0, 7.0 and above ONLY .. ADULTS 18+ ONLY! THANKS TO BASEFACES FOR THE SMILEYS!They replace some of the smileys and are TOO FUNNY!! Only people that have installed the XXX Smileys can see them!!FOR MESSENGER 6.0,7.0,7.5 and 8.0 VERSIONS!!! 6.0.1651-8.0.0.716

Original Yahoo Smileys for Yahoo Messenger 6.0,7.0,7.5,8.0 and 8.1!!- (Uploaded 5-12-06) The Original Yahoo smileys that come with Yahoo Messenger 6, 7,7.5 and 8.0..If you want to get rid of the naughty smileys then get this file..For those of you who want tto reinstall the  originals that came with Yahoo! FOR MESSENGER 6.0,7.0 ,7.5 and 8.0 VERSIONS!!! 6.0.1651-8.0.0.716

YTunnel Pro BETA 2.5 Build 504 (Released 9-27-08) Its finally out!!!!!  FOR MESSENGER 7.0,7.5,8.0,8.1 and 9.0 VERSIONS ONLY!!... ..This is like a firewall for yahoo messenger, It blocks out all the crap that you receive all the time while you are in a chat room.. There are sooo many features I just cant list them all!! Goto the site to read about all of the features.. This is another one of those MUST installs!!! Once you get ytunnel msg me and I can help you set it all up. This software is worth the $22.50 if you chat in the chat rooms!!!

YTunnel Basic 2.5 Build 496 (Released 7-13-07) THE FREE VERSION Its finally out!!!!!  FOR MESSENGER VERSIONS... 7.0- 8.1.0.402 NOW INCLUDES 7.0,7.5,8.0 and 8.1 SUPPORT!!..This is like a firewall for yahoo messenger, It blocks out all the crap that you receive all the time while you are in a chat room.. There are sooo many features I just cant list them all!! Goto the site to read about all of the features.. This is another one of those MUST installs!!! Once you get ytunnel msg me and i can help you set it all up...Ok everyone looks like you HAVE to buy  pro I cant find a download link for it or a site I trust anywhere...ill keep looking.

YahElite Build 314- (Released 3-15-07) Full install. ALMOST--Unbootable Yahoo chat client. VOICE CHAT IS BACK IN THIS VERSION! All bugs are fixed. Uses the NEW YMSG14 protocol  . Features Yahoo smileys.Just added a new spam bot filter for those stupid bots in the rooms!!Yahelite ia a alternative to Yahoo! Messenger.. and I think  MUCH better! Has a brand new interface,  ..read the news when you install it!!YES IT LOGS IN AGAIN!!! THANKS DEEP!

YahElite BETA- (Released ?) Exe ONLY YOU must have the FULL version above FIRST before you get this file..BE sure u save this file to your Yahelite folder BEFORE running the beta as it does not include any of the files to run alone!!The  BETA changes SOO much that There is no way I can keep up with the names..it usually changes everyother day right now the beta is working REALLY NICE!