PEP TUT
This tutorial takes you from extracting a model all the way to editing flaps.
A good read, you know, if you're into that whole literacy thing...
Hmm not sure if this link was already posted here or if I read it when I googled pepakura...
Either way it is definitely a nice and thorough read on pep. Step 6 has some pretty good tips on using the program well.
This is nice. Gives you a good idea on how to get some pep models made, but it seems like it's only geared toward the Homeworld game. Can this method be applied to others?