Fring, the mobile IM & VoIP service has added Yahoo and AIM instant messenger support. Fring already supports Skype, Google Talk, MSN, ICQ, and Twitter. Yahoo! & AIM are currently available for Symbian and UIQ handsets, even though voice calls are not yet enabled.
In other developments, Fring folks informed me that WISPr, a software that allowed you to roam across WiFi networks now works on UIQ handsets. WISPr till recently worked only on Symbian handsets.