There's been some discussions of similar (or identical) ideas:<p><a href="http://news.ycombinator.com/item?id=194028" rel="nofollow">http://news.ycombinator.com/item?id=194028</a> 29 comments<p><a href="http://news.ycombinator.com/item?id=462278" rel="nofollow">http://news.ycombinator.com/item?id=462278</a> 26 comments<p><a href="http://news.ycombinator.com/item?id=2830122" rel="nofollow">http://news.ycombinator.com/item?id=2830122</a> 33 comments<p><a href="http://news.ycombinator.com/item?id=3219747" rel="nofollow">http://news.ycombinator.com/item?id=3219747</a> no comments<p><a href="http://news.ycombinator.com/item?id=3286693" rel="nofollow">http://news.ycombinator.com/item?id=3286693</a> 86 comments<p><a href="http://news.ycombinator.com/item?id=3347468" rel="nofollow">http://news.ycombinator.com/item?id=3347468</a> 39 comments<p><a href="http://news.ycombinator.com/item?id=3702070" rel="nofollow">http://news.ycombinator.com/item?id=3702070</a> 99 comments<p><a href="http://news.ycombinator.com/item?id=3948126" rel="nofollow">http://news.ycombinator.com/item?id=3948126</a> 1 comment