John Schuch (@JohnS_AZ) talked with us about being a semifinalist in the Hackaday Prize, his project, and entering other contests.
John's Hackaday Page
Winning Entry on Mouser 500 Challenge
Honorable Mention on Circuit Cellar's ChipKit2012
Many contests are announced on Circuit Cellar and searching the EEVBlog forums.
IRC channel mentioned is TYMKRS