next-gen.biz has a new article based on NPD statistics:
What are the biggest selling genres for each platform? NPD has the answers.
Football is well represented by strong sales of EA's NCAA, while Xbox' Halo map pack boosts FPS in its rankings. Midnight Club 3's success means racing stays strong on PSP. Kirby and Mario are flying the flag for platform games on DS. Stats are for July 2005.
PlayStation 2
1. Football
2. General Action
3. Platform
Xbox
1. FPS
2. Football
3. General Action
GameCube
1. Platform
2. General action
3. RPG
PSP
1. Driving Action
2. Racing Action
3. FPS
DS
1. Platform
2. Racing Action
3. FPS
GBA
1. Platform
2. RPG
3. Kids