Disclaimer: The links below lead away from TH custom effects and we do not take any responsibility regarding content of these sites.
Resources:
freestompboxes.org – huge and packed with knowledge about stompboxes
DIYstompboxes.com – another great forum
La revolution deux – blog about stompboxes and their DIY counterparts
Other sites with great fabbed PCBs:
madbeanpedals (Brians site with lots of fabbed PCB projects and loads of single side layouts for self-etching)
JMKPCBs (Jacobs site with lots of different projects. We do the EPIC Looper together)
1776effects (Joshs site with very good stuff like the Multiplex Delay)
GrindCustomFX (Rejs site with nummerous fabbed PCBs)