There's plenty of motocross and supercross on TV today over at Speed Channel, including:
 
12 noon (EST)    FIM Motocross from Matchams Park, UK
3 p.m. (EST)  World Supercross from Vancouver
4 p.m. (EST) Canadian Motocross Nationals from Mission, BC
10:30 p.m. (EST) The Motocross Files: Roger DeCoster
 
TiVo it if you can; leave work if you have to!