Adium, the much beloved open source chat software on the Mac, released the [first beta for version 1.4](http://adium.im/blog/2009/05/14-beta-134-release/) on Monday. Major additions include the integration of Twitter and IRC. These are good news indeed for Adium users as these features are much sought after.
Adium 1.4 works under Mac OS X 10.5 only, so no luck if you are still running Tiger. And [the beta page](http://beta.adium.im/) includes an impressive long list of changes and new features.
As with all beta software, please expect bugs.