ONLY AVAILABLE AT THE MOMENT FOR HTC DESIRE 2.2. I DO NOT GUARANTEE FULL FUNCTIONALITY ON OTHER DEVICES. Stay tuned for updates! Nexus one, among other devices, will be supported soon and new functionalities will be added such as Gmail labels notifications!
PROGRESS UPDATE: I did not give up on gingerbread, I''m working on a new update that is working on 2.3, you could download a pre-release on xda forum thread.
GMAIL UPDATE: Google has block 3rd Party apps from gmail 2.3.5. There is no way to get gmail info right now (as you could check on every other gmail-related app). I''m working to fix the FC caused by this blocked. Meanwhile, if you want these gmail-related apps to work, you could uninstall last gmail update. Sorry for the inconvenience...