PS3 will be ahead of x360 this year, atleast in shipped numbers, that for sure.
I mean GT5 release, many people wait to get PS3 just for this game alone.
Anyway, from my old post:
The end of September ship totals were 33.5m for x360. VGC sales for Oct 03 - 32,675,414.
2m difference in PS3 sales between shipped numbers and VGC numbers for almost a year. There is something wrong with VGC PS3 data.