The ability to view other members in the group is awesome, but would be even better if there was a picture of the avatars (like on profiles) - even better still if the most active members of the group wound up towards the top of the list or bigger (or both). Anyway, I think that would make it more like a crowd of friends at a party and that would be fun.
I also think member view would be best on by default (or asking the creator when they set it up).
Editing entries in groups would be really useful - there's a lot of comments on this!
Oh, and please let us have more group slots! Thanks!