I'm still a little confused because some of those links are for bridging a wireless network to a wired one. Basically what my network looks like is this... (please excuse the crude model)
Cable Modem--->4 port Linsys wired router---->4 different computers (one of them is mine). I basically want to take the ethernet wire out of my computer and put it into the Airport Express so i can use my computer and xbox live wirelessly. I'm thinking the easiest was to do this is to just buy the xbox wireless adapter, is this true? I don't see how i can use a bridge because i'm already going to have the ethernet wire in the AE, and it's not like the AE is working off of a base station, it's working off a hard wired router. I hope this clears some thing up.
Also, if i had to go through all these different connections, wouldn't it cause lag or delay?