Sorry for the slow response

A few I lurk in:

Sawmill Creek - both the engraving & CNC
http://www.sawmillcreek.org/forumdis...-Manufacturing

http://www.ladyada.net/library/laser/

http://forums.adafruit.com/viewforum.php?f=18

Also look for a hackerspace or community workshop in your area - they may have a laser:
http://hackerspaces.org/wiki/List_of_Hacker_Spaces