Finally YM8 has been released. I have upgraded to YM8 just now and it can connect to YM and YahooMail. So far so good and i hope there won't be any major issues again. If you have used YM8 beta version, then, you won't see any major difference on it's UI and also it's features. It suppports of plugins, communicating with MSN Live, and free avatars. If you like to get the direct link on YM8, follow this link : http://download.yahoo.com/dl/msgr8/us/ymsgr8us.exe. It has a version number of 188.8.131.522.
Update : In my installation, the 360 plugin was broken. I couldn't start it. It was fine in the beta version. That was strange, as it should work in the final version.