"I have found that some of the devices listed on the FSF's page are claimed
to work with the "n" protocol, but I don't know whether that is backward
compatible with existing infrastructure."
To take advantage of a wireless-N card's frequency, you must also have a
wireless-N router. Most wireless-N cards have wireless-G and even wireless-B
backward compatibility.
Wireless-N is a fairly new standard, so don't go forward with the assumption
that you must have wireless-N or else. Only the very fastest cable and
satellite broadband are likely to benefit from the speed of wireless-N over
wireless-G.
The card I use can be inexpensively purchased here:
http://cgi.ebay.com/D-Link-DWA-643-802-11n-Wireless-LAN-ExpressCard-34-Adap-/370381283688?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item563c71e168
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