This is such a powerful, simple concept. We've discussed this before on HN: http://news.ycombinator.com/item?id=539900 http://news.ycombinator.com/item?id=539

This is such a powerful, simple concept. We've discussed this before on HN: http://news.ycombinator.com/item?id=539900 http://news.ycombinator.com/item?id=539900 And there's a whole forum dedicated to this style of product creation / testing on Tim Ferris' site: http://www.fourhourworkweek.com/vBulletin/forumdisplay.php?s=9ae24b28914ac9d68687698104da781e&f=5 http://www.fourhourworkweek.com/vBulletin/forumdisplay.php?s... Lots of goodies buried in there.