The popular Twitter client from Kisai Labs, Blaq for BlackBerry PlayBook, has been updated to v1.8.2. So far one thing I noticed about this update is that you can now swipe down the menu and easily change between multiple accounts. This is especially handy for me as I'm always changing between the @BlackBerryOS account and my personal @BBOSJoe Twitter account. I haven't seen a changelog, so be sure to let us know in the comments of any other improvements that you notice.
You can purchase Blaq for PlayBook via App World for only $1.99.