Geospatial
X Y Look-up Resources

Web sites that provide Lattitude and Longitude
and/or State Plane Coordinates

GPSVisualizer

Enter an address for it's lat long values:
http://www.gpsvisualizer.com/geocoding.html

Lat-Long-finder Free tool based on Google Maps:
http://www.satsig.net/maps/lat-long-finder.htm
Google Earth Download Site for Viewer:
http://earth.google.com/
TerraServer-USA Start Page:
http://msrmaps.com/Default.aspx
Google Maps Enter your Lat long as search terms
Example of format: (40.05789,-82.972527)
http://maps.google.com/