Multi-protocol chat client Trillian follows up its resurgence last year with a long-rumored Mac version. Trillian for Mac is an unstable alpha, lacking many of the features that make Trillian Astra appealing on Windows, but even so it offers users a good idea of what's to come from Cerulean Studios.
This build isn't really ready yet to compete with the popular Adium, but cross-platform users will appreciate that the contact sync works. Enter in your Trillian username and password and all of your other instant messaging accounts will be imported, including passwords. Basic IM functions are fine, with support for Trillian's proprietary protocol Astra, as well as Windows Live, Yahoo, Facebook Chat, AIM, ICQ, XMPP, Google Talk, Bonjour, and MySpaceIM. File transfers work, as do most Mac hot keys, iTunes tracking, thought bubbles above avatars during chats, and drag-and-drop.
There's much that's missing, though, so don't expect to jump to Trillian right now. Social network feeds don't work yet, nor do group conversations or e-mail support. Growl support is also missing, and while you can see your friends' avatars, personal avatars aren't working yet. The Preferences window is skeletal, too. The full list of what should work and what doesn't is here.
Cerulean Studios also offers an iPhone version, and Trillian for Mac will sync contacts and other changes with its iPhone sibling. Tell us your thoughts on Trillian for Mac in the comments below.