I've got two PC's running on a wireless network through an ADSL modem. (LinkSys, I forget which one....) but it has wireless support (obviously) and four ethernet connections.
Set up was a relatively painless experience. The most difficult bit was getting the information required for setup from my ISP. They guy on the other end of the phone didn't seem to understand what I was talking about. Seemed I knew more about wireless and ADSL connections than he did.....
Now all running nicely. We've just inherrited a laptop which may go wireless soon with the aid of a wireless adapter card. Then I can stream my mp3's into the garage, along with car data from this forum while I tinker away...
Make sure you encrypt a wireless network though with a good (ie difficult and complicated) password. There's someone in my neighbourhood with an open network... :SHOCKED: Not good....