GPS Visualizer's Quick Geocoder
Find the latitude and longitude of an address
This page returns coordinates provided by the Yahoo! and Google Geocoding APIs. Both services only allow each Web site and/or IP address a limited number of queries per day; please don't abuse it.
If you disagree with the coordinates shown here, you'll have to register your complaints with Yahoo or Google. (If the results you get are close but not exact, you can move the map around until the center crosshair is over the proper location, then read the coordinates from the "Center:" box in the lower-left corner of the map.)
To geocode many locations at once, see GPS Visualizer's Easy Batch Geocoder.