Here are some previous submissions of this or related items:<p><a href="http://news.ycombinator.com/item?id=1604148" rel="nofollow">http://news.ycombinator.com/item?id=1604148</a> <- Many comments<p><a href="http://news.ycombinator.com/item?id=1639049" rel="nofollow">http://news.ycombinator.com/item?id=1639049</a><p><a href="http://news.ycombinator.com/item?id=1671845" rel="nofollow">http://news.ycombinator.com/item?id=1671845</a><p><a href="http://news.ycombinator.com/item?id=2524122" rel="nofollow">http://news.ycombinator.com/item?id=2524122</a><p><a href="http://news.ycombinator.com/item?id=2878511" rel="nofollow">http://news.ycombinator.com/item?id=2878511</a><p><a href="http://news.ycombinator.com/item?id=3124871" rel="nofollow">http://news.ycombinator.com/item?id=3124871</a><p><a href="http://news.ycombinator.com/item?id=3561007" rel="nofollow">http://news.ycombinator.com/item?id=3561007</a>