There's some great info out there that is useful for the DIY pedal community, but it's not all in one place. This is a smattering of what I've found useful while learning how to make effects pedals:
Stompbox Wiring. How to lace up the pedal when you're finished with the board.
Dealing with PDFs. PDFs are great for some things, but can be a hassle as well. Learn all about how to deal with them (including getting rid of pesky password protections).