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The guys at my local hardware suppliers recommended that I ask a question in an online forum, so here it is!
I use a Netgear WGR614 with my Powerbook without any hassles.
After you've got your router/basestation, configure the Airport using the Network System Preferences pane in OS X to use the basestations IP as the 'Router'.
Configuring WEP and MAC address filtering is a little more of a hassle, but using the online help provided with the router it should be self explanatory.