Here's a link for OpenSUSE that is pretty close to what I have set up. Most of the stuff in there is not distribution specific. I'm running two PXE installation servers - one at home, one at work. Strictly Linux and DOS installs (for BIOS flashing purposes), but it's possible for Windows as well.

The trickiest part is the DHCP config, necessary to direct requests to the TFTP server. I can't comment on the method used in the article above, as my DHCP server is part of my firewall, and the setup is different. If you're interested in how to do it using m0n0wall, I can provide details on that setup.