Just installed and had a quick look, liking what I see very much. Many of the features/enhancements I have in mind have already been suggested. Here are a few that haven't:

1. Full screen mode option - aside from extra real estate, one you implement fb theme pervasively, it does look better IMO.
2. More button on the bottom of the news feed
3. Notifications button has number of new notifications in brackets

Cheers for a new app to play with!