Here is a list of links that I have found useful while programming for the CPU in 0x10c

community links:
http://0x10c.com – Game Website
http://0x10c.com/screenshots – Notch posts screenshots here
http://0x10cforum.com – Official Forums
http://reddit.com/r/0x10c – Official subreddit
http://reddit.com/r/dcpu16 – DCPU programming subreddit

Emulators:
http://badsector.github.com/dcpustud/ – DCPU 16 studio

Programming links:
I will add some later :D