I'm sure a lot of you have seen this website or a similar GIS system for your home state/county. This is a great way to find out who owns that piece of property you've been dying to search. It can also clearly identify parks, school property, etc. I'm not sure because I haven't tried this yet, but I would assume that the maps could also be over-layed into Google Earth too. Good luck and Peaceful Hunting!
http://beacon.schneidercorp.com/
http://beacon.schneidercorp.com/