I came across a rather useful, and interesting site today, whilst browsing some gaming forums. NextGenWars.com provides an in-depth count of the number of each next-gen console sold. The PS3, (at the time of writing), had just broken the 306,000 consoles barrier. The Wii, sat comfortably above the 534,000 threshold, and leading the pack, the Xbox 360, with an astounding 7,530,570 sales.
It's going to be a tight one. Current, updated sales below. The tallies should auto-update. If they don't, refresh to see what the current standings are. It's nifty. A highly recommended tool to stick in your forum signature, if only to show off your console's impressive number of sales!