Too bad gas is so high. I'd love to just jump in the car and visit every spot
on this map.
http://www.traveltex.com/tours/TexasGhostTowns.aspx
And when you're done with those ... jump the border and come to California. We have some interesting ones here also.
http://www.calicotown.com/
http://www.ghosttowns.com/states/ca/casouth.html
This is a great site and soesn't just cover Colorado
http://www.ghosttowns.com/states/co/co.html (http://www.ghosttowns.com/states/co/co.html)
Arizona has gotta have the best www.azghosttown.com
(http://i73.photobucket.com/albums/i231/LittleCasino/Willies%20Images/800px-Ghost_town_-_Jerome_Arizona.jpg)
Bodie in CA and Jerome in AZ make my vote as worthy of visiting. Bodie is more truly a ghost town, but Jerome, although livelier, has some interesting aspects. Both (especially Bodie) require going a bit out of your way, but are worth it!