For the longest time twitter on Android really stunk. We had to rely on third party apps to give us our twitter fix as the official twitter app was pretty much unusable. The last few updates have made twitter look better and function better. The official twitter app is now usable thanks to a new update. This update includes a new UI. The new app uses a sidebar for most functions and gives the app a whole new look and feel. Version 5.0 is in beta testing now, and should be released soon!
Sign up for the beta here via Droid-Life