I really wouldn't be shocked if the PS3 did pass the 360 by the end of summer. The PS3 is consistantly out selling 360 even without any big titles coming out right now to drive sales, so its not hard to imagine that it'll be worse as the big games drop.
PSN ID: WAR_MACHINE77 Wii friend code: 7186 4304 6064 5134 Gamertag: WARMACHINE mk2