Nice tour in PCB fabrication process :) http://t.co/eTtAue0 (http://t.co/eTtAue0)
HAH! I saw the strange URL, went to share my link to the Base2 tour - and found out it was the same site as you already have . . .didn't realize the t.co was a twitter thing.
this is a really nice overview. I don't think they go into multi-layers too much though, which is also some pretty interesting stuff. Here's a link to think tink - which has a lot of material geared towards the well-equipped DIY PCB maker:
http://http://www.thinktink.com/stack/volumes/volvi/pcbproto.htm