Several weeks back I posted the first of the SXSW 2012 pre-film bumpers to be released online. I noticed that quite a few more of these gems are available. You're welcome... ;-)
Saving Seats (which is one I didn't actually see at the festival)
and "Theater Bum" which was the first released
There are definitely a few bumpers that haven't made it out yet - but I'm continuing to keep an eye out.