Re: @ Group
I thought about this as well.. I think we could use a unique symbol (! is pretty good indeed) and attach that to a groupname or groupID (for longer Group names).
The reason why I think this could be very cool if you’d combine it with the TweetStream plugin.
I image it working like this:
User syncs his profile with Twitter through TweetStream. Then makes a post from his mobile phone/twitter app:
“!buddypress this is a status update for the group “buddypress” on my BP site”
The tweet gets converted to a status update for the group BuddyPress and voila, you can post updates to your groups through twitter from everywhere!