You'll be well advised to remove that URL 'cos that sort of thing is frowned on in these here parts.
As for the three blocks of ads, I've been reliably informed that some webmasters have been allowed to test multiple blocks of ads. Frankly, if a page like that isn't purely a vehicle for AS, I don't know what is.
Google IS testing multiple ad units on some pages--that's been reported before. Given the way AdSense works, I would guess that Google can easily detect unauthorized "double-serving" and so if you come across a site with two or more AdSense ads on a page, they are either part of the testing or put them up so recently that they haven't been caught.