DR.APP Unusually well done.
Although it misses many small things like hiding groups, compact contact list, a way to choose with which service you want to initiate a chat, option to disable some of the notification sounds, option to connect upon startup without the need of clicking on my astra account and a few other here and there, I like it very much.
Even if it's not identical to iChat, I think it retains its simplicity (which others may dismiss as lack of customizability but I don't).
Keep up the good work, you are definitely onto something here.
(Version 1.0.0.102)