It lets you find the best ranked tutorials on the web in an easy manner. really easy to use and intuitive. I found some new gems already.
None so far.
So far I've used it a couple of days and I'm really happy. It does what the name says, you can upvote tutorials so other people get to see the best tutorials and don't have to loose any time with bad tutorials.VIVEN GmbH has used this product for one week.