I've never liked Mint.com. Not because they're bad at what they do (they're not), but because you have to drop your trousers to take advantage of it. So you get a little money management help, so what? You have to give away your password to do it. Not only that, Mint is (surprise, surprise) using all that juicy data you provide for their own purposes.
For now, it seems that they're not actually telling you who purchased what, but there's no telling when and if they'll start selling your valuable personal data to 3rd parties (maybe they are already). Until then, showing truly anonymous purchase information is kind of neat so long as they don't take it further than that.