Not that I really want to hype other blogs here (lest you find them more amusing or worthwhile than myself) - but I have a cool one I want to point out: MIT Advertising Lab
I'm not sure if there's a "real" place called the MIT Advertising Lab, or if they're just playing off the name of the somewhat famous MIT Media Lab.
Either way, one of the latest tidbits there is about a company in Japan that puts ads on the backs of free photocopies. Pretty clever.