Man I hate it when people repeat other's posts over and over when they already suggest that same game (I don't know how many times Avatar and King Kong were mentioned...)
I have this magazine called the XBox 360 Handbook, and it says you can get 10000 points within 30 hours by playing the following (I'll summarize the article to the games):
Hour 1
College Hoops 2K6 - 1000 points
NBA 2K6 - 1000 points
Hour 2
NHL 2K6 - 1000 points
Madden NFL 2006 - 1000 points
Hours 3 - 5
Galaga - 200 points
New RallyX - 200 points
Pac-Man - 200 points
Ms. Pac-Man - 200 points
Hour 6
Uno - 200 points
Hours 7 - 10
Open Season - 1000
Hours 11 - 15
Fight Night Round 3 - 1000 points
Hours 16 - 22
Tony Hawk's American Wasteland - 900 points
Hour 23
NBA Live 06 - 1000 points
Heavy Weapon - 100 points
Hours 24 - 28
Fusion Frenzy - 1000 points
In the article, it mentions that a lot of the games you'll most likely tweak the difficulty (Tony Hawk's American Wasteland), or simulate the 30 seasons in Madden 06 for instance.
Hope it helps out.
