I love this thread - so unreasonable!
I'll chip in by noting the following:
1) PS3 lead (Burnout I believe) is fractionally better on PS3 than 360
2) no lead (COD4 & DMC4) pretty much equal - fractionally better textures on 360 some extra post-processing PS3
3) 360 lead - noticable difference in PS3 (and not in a good way)
4) 360 to PS3 port - mostly poorer on PS3 so let's hope Bioshock bucks the trend
Try to be reasonable... its easier than you think...