Another item to file in the Cool Internet Tricks department: Bible Geocoding. Most notable is a Google Earth map of every location from the Bible; you can click on a location to pull up the Bible passages in which it's mentioned. Pretty nifty.
Very useful the next time you want to trace a Bible story as it unfolds across the ancient Mediterranean world, or when you really just need to find out where Ezion-geber is located. Also of interest on that site are other goodies, like an Bible geography overlays for Google Earth and lots of photos of Bible locations.
(Via an ESV Bible blog post about linguistic Bible maps—definitely something for the "really cool, but I'm not sure what to do with it" file.