This is a very good intro to rubber stamp making from Home and Garden
Television:
http://www.hgtv.com/hgtv/cr_stamping/article/0,,HGTV_3337_1370359,00.html
If you scroll down you'll see more stamping article links on the left hand
side. Lots of wonderful ideas to adapt for stamp journals for your
letterboxes.

M a r y K i n d r e d aka Minky who is working on her first letter box ;-)

marykindred@thelibraryproject.com
http://www.thelibraryproject.com