We've got an Apple iBook with built-in wireless and a (now somewhat ancient, 3 or 4 years old) linksys router. Ethernet from cable modem goes to linksys router and magical wireless radio waves go to the iBook (and, of course, back again). Set-up was a doddle! Mac OS X recognizes working wireless networks automatically, and I just used the default settings on the linksys router. It just, as they say, worked.