Polymer Stamps

The majority of the sites I found online were attempting to sell kits or instruction booklets or offering to make stamps froma design you send them. However, I managed to find a few sites with actual instructions.

Making stamps with polymer resin
http://www.stamps4u.com/

Carving stamps
http://ourworld.compuserve.com/homepages/franontheedge/RubberCarving.html
http://www.crafty-moms.com/articles/010501c.shtml