I didn't get to read that many novellas from 2009, but the small number I read included some outstanding stories. I plan to nominate these five for the Hugo Award:
Nancy Kress, Act One (Asimov's, March '09)
John Langan, The Wide, Carnivorous Sky (By Blood We Live)
Ian McDonald, Vishnu at the Cat Circus (Cyberabad Days)
James Morrow, Shambling Towards Hiroshima (Tachyon)
Jason Sanford, Sublimation Angels (Interzone, Sept-Oct '09)
With the exception of "The Wide, Carnivorous Sky," which is more likly to appeal to horror readers than SF fans, all of these have a reasonable chance of joining John Scalzi's The God Engines on the Hugo ballot. (I haven't yet read The God Engines, but given Scalzi's popularity with the Hugo voters, I am confident he doesn't need my help.)
Good luck to all of these deserving authors!