AdiumX was just updated:
Adium X 0.80, a major update to its multi-protocol instant messaging application. Adium 0.80 brings a completely new status system with available messages and invisibility on supported protocols, built-in secure encrypted messaging via Off-the-Record Messaging, the long-awaited file transfer progress interface, customizable built-in Growl notification system support, blocking, customizable service and status icons, full OS X 10.4 compatibility, and much, much more