Couple of recently announced "best of" anthologies

1. David G Harwell & Kathryn Cramer (eds)' "Year's Best SF 17" (2012). ToC. Collects fiction originally published during 2011.
2. Jason Sanford (ed)'s "Million Writers Award: The Best Online Science Fiction and Fantasy". ToC (need to scroll down at linked page).

Related: "Best of" lists.