The Nikon D3X!!! According to Popular Photography magazine. Wow congratulations Nikon! The D3X won due to it's unmatched DSLR image quality. Medium format quality in a DSLR package. Sorry I doubted you D3X :^)
The finalist losers were the 7D and E-P1. They said the 7D has the best APS-C image quality but lost because it brings nothing new to the table. The E-P1 is a new kind of camera but lost because the auto focus was too sluggish and it doesn't have a wide selection of lenses.