I use the Linksys WRT54GUK (I think that's right).
There's three computers accessing it - no problems at all.
The coverage of the wireless is pretty good too, and I can even sit at the bottom of the garden with the laptop connected to the network.
http://www.pcworld.co.uk:80/martprd/product/LINKSYS/WRT54GSUK/250537 on PCWorld (and it's gone down in price tremdously!)