Just finished the “greplin challenge” ( http://challenge.greplin.com/ ). Sure it was a good distraction, but it has gotten me thinking about idea #79 for a weekend project. Build a system that hosts Programming Challenge questions for companies, has a basic interface for validation of inputs/outputs and submits results.
Users register — have score boards of completed questions, etc, etc.
Companies can — review canidates, potentially see what other problems they’ve solved (right answer on the Company Q challenge)… Oooh valuable…
Growth opportunities, maybe some quizes like elance to rate your skills.
Anything else? Thrift server as the basis of the API for some challenge questions.