http://www.earthtools.org/ - huge map with decimal coordinates corresponding to its center crosshairs. You can also select location on the sidebar and get values for 4 different coordinate systems including UTM. other items on the sidebar include sunrise/sunset, elevation in meters or feet, and time zone and local time.
GPSies has a little smaller map, but still bigger than Terraserver. What's nice on this one is wherever you click your mouse on the map it creates a popup with the Cartesian and decimal coordinates, elevation, and address of the point selected. Its sidebar has pretty good search facility for address or coordinates and allows the user to download selected point as waypoint or destination to Google Earth KML or 7 different GPS formats.
Geo-Tag is about the same size as TerraServer but is a worldwide system that is fast because it has no frills. A simple click on the map updates its decimal coordinates below. Geo-Tags are actually for embedding GPS metadata in html code, but its so quick, I thought it deserved mention.
Virtual Earth Interactive SDK I believe was mentioned somewhere before and this link has the ability to display the decimal coord but was a little confusing as to where the coords relate to the map. I will give the credit for one thing its the most accurate with 14 digit after the decimal point (GIVE ME A BREAK - THAT KIND OF ACCURACY IS IMPOSSIBLE)
The most interesting find of the day and getting back on topic was LookLOCAL.
This is a website that uses Virtual Earth and overlays TRAFFICCAMS and TrafficAlerts. A click on any of the cams generates a popup of the current cam's JPG image. For example , on a city level it shows 66 cameras around the city of Houston, TX and 14 traffic alerts from lane closures to traffic incidents, disabled vehicles, or just slow traffic. And thats just 1 quadrant of the town the total has to be well over 150. I'm gonna add this map to my collection of interactive maps for RoadRunner along with the weather.
Now that everyones well armed, Enforcer you may have to figure out how to increase your database limit sooner than you thought.