The Official Twitter App from Android just got a 2.0 upgrade…See Details.
@TatWza

The new code has a modified interface, and some feature improvements and additions, including:
Use without having to sign-in
Single window layout
@mentions are now included in the replies tab
Autocompletion of usernames
Universal search
All of that sounds like what Social Scope, and Ubertwitter already does
See what Twitter has to say about it
Twitter Blog