There are many a linux distro out there, many for desktop and server use, but some have specific goals. The first ones that come to mind are BackTrack and Caine.
Backtrack is specialized in penetration testing.
Caine specializes in computer forensics.
My question is: are there other such distro's: with one specific goal in mind, not meant for everyday desktop use.
EDIT: Check this test out: http://www.zegeniestudios.net/ldc/ Based on several relevant question, the site determines a good linux distro for your needs.