Five years ago today this was the top item on HN (http://news.ycombinator.com/item?id=55974): Post novel startup ideas as comments and see how many karma points it receives. Who knows, one might be developed and you can take credit for thinking of the idea first.. It had some interesting ideas, some of which are solved or obsolete. Thought it might be fun to do this again.
(I run Wayback Letter, so that is how I know this odd bit of information - http://www.waybackletter.com/archive/daily/09-18-2012.html).