Not only is Y! Messenger for Mac painfully reaching 3 beta but it clear that the folks who worked on Yahoo Messenger for Vista changed their mind…. So do you intend to release two messengers for Windows and add another good layer of peanut butter when Mac users are asking for basic features?

how about Skyp is this best or not then yahoo

Skype is basically for making "calls" : PC-to-PC or PC-to-Telephone.

But Yahoo messenger can double up as a voice chat client, so I only use Yahoo for chatting / conferencing with friends.
Btw, an update for Yahoo Messenger 9 Beta : Version 9.0.0.1389 -> 9.0.0.1912 (Download - Yahoo! Messenger 9.0)