I haven't seen anything official (or as official as things ever get from the single speed folks), but it appears NorCal native Rachel Lloyd took the Women's Single Speed World Championship and Carl Decker won the men's.
Here are some links to run down what went down this weekend:
MTBR SSWC 2008 thread
SSWC 08 ... Oh Snap !
Jacquie Phelan's SSWC roundup
Single Speed Tandems ?
Carson Blume's blog and photos (thanks for the links, Carson)
Tatoos ? More Tatoos ?
Oh, and it looks like 2009 Single Speed World Championships are bound for Durango, Colorado.