Can you use one Xbox live card with all games that support live?
Also, is Halo 2 the only game that you (both of you, and any more members that might be viewing this) have that supports live?
I am not registered with live, but I might if anyone has
Splinter Cell Pandora Tomorrow,
Need for Speed Underground 2,
And the others that I have that I'm not sure that takes LIVE:
Mission Impossible,
Dukes of Hazzard,
etc.