The open source Lemma Twitter client for the PlayBook got a small update to v1.1.8 this week. Their blog details that this update adds one often requested feature of viewing more than 50 tweets at a time. Now you can just click on the “touch to load more tweets” button to get access to more. They have also fixed a bug with the previous and next list buttons that were off by one.
Check out the free Lemma client in App World