If I get some free time I'll look into it, but for now I've got too much work to do.
Don't put too much effort into it.
I've decided I can't be arsed for now, and I've just got the 15 metre ethernet cable going from the kitchen to my room. It's messy but it works.
I just wanted to know if I could conveniently not have wires with one WiFi connection in my room.
Edit: Someone on another forum pointed out that it would only work if the host computer was connected directly to the internet, and not through another router.
Dammit. I don't want to spend £40+ on a gaming ethernet wireless adaptor.
Does the 360 use any USB wireless adaptor, or is it only the official one that works? £55 is a rip off if I can use any sub £20 wireless G adaptor.