When these mapping sites first came out people thought they were all the rage. Then we discovered they worked great in downtown San Francisco, which is where you'd drive a Venture Capitalist around to show them your maps work. But Yahoo soon turned out to be flakey - once you got to the Boston area it would cheerfully give you directions off by 8 miles or so.

Google maps came along and was better, for a while. Apparently they're trying to be suck-compatible with the others now. I just hit google maps for "800 F St. NW, Washington, DC" to look for the Spy Museum in DC. It's proudly trying to tell me to go to 800 F St, SE. In case you don't know Washington DC's mapping system, they replicate street names in a compass around the capital. So F Street, Southeast, is many blocks away from F Street, Northwest.

Oh, well. Part of the Shmoocon mistique, I guess ;-)