D-Link has just come out with a USB wireless adaptor that supposedly works with OSX. It is half the price, more portable, and less hassle than installing an airport card. But I have an "older" G4 (purchased 2001). How can I find out whether my USB port is USB2 or 1? And depending upon that answer, wouldn't my USB port be a bottleneck, bringing my wireless connectivity down way below the advertised 11mbps for the wireless adaptor?