Twitter for BlackBerry, which is still in closed beta, has been updated to version 1.0.0.37 and leaked online.  BBTweeps has list OTA download links for:

I’ve just installed Twitter for BlackBerry v1.0.0.37 myself and haven’t had but a few minutes to play with it, however, it does seem to be a bit faster and it looks like the @mentions screen is now cached.

[Via BBTweeps]