Adium, my favorite multi-network instant messaging app for the Mac, has released version 1.3.6. The new version includes an updated libpurple to fix a vulnerability with the MSN protocol as well as an updated version of the Facebook chat plugin and numerous bug fixes.
If you use Adium, I highly recommend upgrading.
Meanwhile, work continues on Adium 1.4. If you'd like to help beta test, you can change your preferences to automatically download the latest beta, or visit the Adium beta page.