Up until the other day I'd been running XP only (I didn't bother with Vista) then I decided to install the W7 Beta so I could dual boot with it and XP. I must admit to being pleasantly surprised with W7, the biggest revelation being Crysis (the only game I've installed so far in DX10) anyway, I was wondering which other games/demos show a significant enough improvement with DX10 to be worth playing on Windows 7 rather than XP.