is it possible for me to have 2 NIC cards working at the same time?

here's the reason i asked. right now, i have my pc connected directly to my xbox via crossover cable (don't ask why). i would like to have an internet connection to my pc, but everytime i have to unhook the xover cable and plug back in the normal networking cable.

i don't want to use a router because that will really screw with my xbox to pc connection.

what i'd like ...

nic 1
[xbox] <-----xover cable -----> [pc]

nic 2
[pc] <-----network cable -----> [internet]

possible?