Fastr: A cool interactive game where you see a bunch of pictures randomly displayed from Flickr and have to guess the tag that relates to all of them. A few technical bugs, but fun anyway.
Bad Design Kills: A great viral site for designers, with printouts to put all over the office to help stop bad design.
Googlewhacking Official Site: No, it’s not what it sounds like. The googlewhack is the global quest to find two word search strings that only result in a single google result. The ultimate googlewhack? Domitianus Gynophobia.