Xbox 360 Live connection

I have DSL internet access with my PC and I’m wondering what I need to do to use it to connect my 360 to Live. Going by what I’ve read at xbox.com, I believe I need to connect my PC and my modem to a router, for starter; as for the Xbox 360, seems I need to get a Wireless Network Adapter (the PC/modem and the 360 are on different floors and I can’t have a cable running along the house). Is that it? Can anyone who has a similar setup confirm this?

A surprisingly popular topic lately.