If you want to take your XBox wireless, then you definitely don't want to waste money on the ntl console service, as you'll have to get a router anyway (wireless router).
You will need a wireless router to connect to the modem & share the connection, & a wireless ethernet bridge to connect to the XBox & make the XBox "wireless".
A wireless router is basically a normal NAT router (with built in 4 port switch for any wired devices), *plus* a built-in wireless access point (WAP).
examples of good (IMO) wireless routers:
Linksys BEFW11S4 - wireless B router
Linksys WRT54G - wireless G router
wireless bridges:
Linksys WET11 - wireless B bridge
Linksys WET54G - wireless G bridge
or
Linksys WGA11B - wireless B "Gaming Adapter"
Linksys WGA54G - wireless G "Gaming Adapter"
Useful thread on XBox wireless gaming:
http://www.cableforum.co.uk/board/showthread.php?t=1342
Useful thread on wireless networking in general:
http://www.cableforum.co.uk/board/sh...ad.php?t=16296
Wireless security:
http://www.cableforum.co.uk/kb/78/ho...reless-network