Though on a worldwide scale - NPDs including XBLA worldwide sales based on my XBLA August Analysis:
http://www.gamasutra.com/php-bin/news_index.php?story=25167
MADDEN NFL 10 (360; Aug-09) 928,000
WII SPORTS RESORT W/ WII MOTION PLUS (WII; Jul-09) 754,000
MADDEN NFL 10 (PS3; Aug-09) 665,000
BATMAN: ARKHAM ASYLUM* (360; Aug-09) 303,000
BATMAN: ARKHAM ASYLUM* PS3; Aug-09) 290,000
TRIALS HD (XBLA, Aug-09) ~246,000
SHADOW COMPLEX (XBLA, Aug-09) ~225,000
MADDEN NFL 10 (PS2; Aug-09) 160,000
TMNT Re-Shelled (XBLA, Aug-09) < 160,000
DISSIDIA: FINAL FANTASY (PSP; Aug-09) 130,000
Admittedly it's kind of cheating, but even if the sales were 60% American (I'd imagine it's around this) the games would still all be in the Top 10.