Keys for Desura were uploaded and should be available at http://www.desura.com/collection.
For users who bought directly from my site, you can redeem them here: http://www.thebignic.com/zombies/support.php
IndieGala keys are in the works. have been sent.
GamersGate and IndieBundle keys also in the works, but waiting on response.
If you have questions or concerns, get in touch: http://www.thebignic.com/zombies/support.php