It seems very impressive - handling multiple accounts and most usefully (for me) allowing the creation of groups to allow you to follow multiple users grouped into categories. It also (apparently) allows access to Facebook accounts too - however the account setup just hangs for me.
It runs on Linux via Adobe Air - which is a bit scary closed/proprietary but probably becoming a "necessary evil" (like Flash)... sigh.
Let's se if it changes/improves my use of Twitter.
