It's not actually new at all, it's been around for several years. However, I just recently heard of it when Scott Adams (of Dilbert fame) wrote about it on his blog

It's called Basic Instructions. Most of it is hilarious. And to top it off, there's several years' worth of archives. Now that's not going to be as bad as UserFriendly in terms of productivity loss, but that's mostly because I have no productivity left to speak off.