Wi-FiHotSpotList.com (one of the sites by Internet.com).
Don't be fooled! CNet's hotspot locator is done by the same folks that do Intel's. It's cnet.jwire.com vs. intel.jwire.com. I haven't confirmed it but I suspect they use the same database.
I know it sounds weird but D-Link has a web-based emulator for their DI-624 802.11g router. I intend to upgrade my 802.11b setup in the very near future so having something like this available is very helpful and increases my regard for D-Link. The feature set and configurability of this router is pretty impressive. And it's cheaper than the Netgear WGT614.