Features:

Windows, Mac OS X and Linux compatible
Encrypts your conversations, files, etc.
No ads, no spyware, no sharing of personal information
Text Messaging
File Sharing
Whiteboards
Voice
Encryption
Privacy
Conferencing
Presence
Logging
Offline IMs
Direct Connect

What's New:

BitWise Plus, UPnP on XP, multi-file requests, new icons, UI cleaning.