Originally Posted by GoldenBullet
from reading this i would say that no you couldnt, at least wirelessly. but you might be able to do it using a special crossover ethernet cable, but im not 100% sure
why would you think that? from reading that i would still say your 99% likely to be able to do it
now i'm 1005 sure
Q: Can I play System Link between Xbox and Xbox 360 consoles?
A: Yes! System Link works with any mix of original Xbox and Xbox 360 consoles.
just keep in mind that both consoles will need the same versions of teh game installed on it, so if one unit has had a halo 2 update through xbox live, the other colsole will have to have it as well in order to work