Google April Fools —
It's an entire search engine devoted entirely to April Fools. Put in a word and it pulls up every page related to April Fool's Day that contains that word. The Museum of Hoaxes seemed to figure prominently in the results for the few words that I picked at random, which I thought was cool. For a second I thought this was something that Google itself had created, but then I noticed the small disclaimer at the bottom: "This parody by Philipp Lenssen is unrelated to the real Google".
Last Resort Retrieval —
A few of you have noticed the strange ad that is now running on my site (in the left-hand column) for a company called 'Last Resort Retrieval' that claims to specialize in recovering stolen art. Yes it is a hoax site, or rather it's part of a marketing campaign for a product other than a company that recovers stolen art. But that's about all I can say about it, because I'm supposed to keep the secret (since they're paying me to put the ad there).
The thing is, I really don't think it…