According to Mozilla, the following updates are in Thunderbird 3.1:

•   New Quick Filter toolbar
•   New Migration Assistant
•   Saved Files Manager
•   Several fixes to improve upgrading from Thunderbird 2
•   Several design improvements and corrections to the interface
•   Stability, memory, and password handling improvements

So if you use Thunderbird, start your upgrade engine now.  Available here.  Or if you wan the local language version for our Non-English speaking customers: here.

-- Joel Esler | http://blog.joelesler.net | http://twitter.com/joelesler