How do you setup your own Bitcoin / Litecoin / Primecoin / Altcoin pool? Whats a good tutorial?
You may find my answer on how to start mining Bitcoins useful, as it touches on setting up your own pools:

How can I start mining Bitcoin?

Also this post goes into a bit more detail on using Stratum + Push Pool.

How to setup stratum with pushpool and VARDIFF? (litecoin)

Some info on eloipool configuration:

Managing Diff variable on eloipool software

If you wanted some more specific information let me know.