We are closing in on the release of Adium 1.4 and have released a new beta, b18, today.
Most prominently, this release fixes Twitter support, disables Facebook authorisation requests and refreshes many translations. Adium 1.4b18 also takes libpurple to version 2.6.6 with some selected changes from 2.7.0 fixing Yahoo! Japan login and bringing greatly improved Gadu-Gadu support. It is available via Adium’s integrated Sparkle updating mechanism and at the beta page where you can also find the full list of changes made since b17.
Please test contact management in particular – combined contacts, (re)moving contacts and the like – since substantial parts of the contact lists have been rewritten for Adium 1.4.