Twitter for iPhone has been updated to 3.3 and includes a new Quick Bar to show trends without leaving your timeline.
The mystery is knowing which bugs are fixed. One of the biggest bugs I've experienced and seen others complain about is the incorrect badge count - the notification badge always says "1" regardless of how many new mentions or DMs you have. The other big one is that DM's show up as new even though they have been read. Hopefully these bugs have been fixed.
If you pick this one up, let us know what you think!
[Free - iTunes link]