Getting Longitudes and Latitudes with Google Maps
Google Maps is pretty slick. Double-clicking a point in a Google map centers the map on the double-clicked point. You can zoom in using the "zoomer bar" to the left, and double-click again to get a better hit on your point. If you click the link to this page to the upper right, you should see something like:
I'm not sure which latitude and longitude that is -- WGS84 at zero elevation? I need to check.
The sample point is an Atlanta landmark -- The Varsity.
UPDATE: JB's hack makes it look like the coordinates are either WGS84 or NAD83.