Again, i'm not saying they are a scam site. The site looks professional and it's creator might be honest. I just wouldn't trust the site because they do not have any real contact information directly listed on their site and the domain is registered with fake data.
The site is a ripoff from
flattr. The owner seems easy to contact and an honest guy. But I agree, I would prefer a real contact information. He posted in some other thread... here:
https://bitcointalk.org/index.php?topic=37190.0