OS question
 

Since I've joined LQ I've seen quite a few different names of Unix/Linux type OS's. Could someone give me a quick run down of what OS's are for what?

Hi Kage6060, Welcome to lq. Have a look at distro watch.
Good Luck. ;-)

Hmm, there really is no specific purpose of a Nix OS.

SUN Solaris
SCO OpenServer
SCO Unixware
IBM AIX
HP UX
Linux - I won't even go down to the specific distributions
BSD - many variants here also
Apple OS-X - yes this is Unix ... well BSD

there are still more

NCR Unix
IRIX
Lynx

...

Not really a particular purpose for any distro. I would not that each distro is certainly targeted at different audiences.
Check out distrowatch.com. IMHO Ubuntu or PCLinuxOS are a couple of the best for new users.

Some distros have specific uses, e.g. rescue & recovery, targeted at old / resource poor systems and so on. Most distros are genereal purpose however.