So a while back I to let me use Eudora instead of Z-Mail. I downloaded the free version, which of course comes with ads. Usually they’re fairly unobtrusive – ads for Eudora itself, or other software – geeky things like that. Today I was surprised to see an ad for , which was immediately followed by an ad for . How on earth did it know I’m into kayaking?! Even if I’d filled out one of those demographic profiles (which I probably did) I doubt it got more specific than “sports” or “water sports” – and it’s not like I’ve e-mailed anybody about paddling, either. (If I had and Eudora had picked up on it, that would presumably be a serious violation of privacy laws.) I just find it neat that the program actually picked out ads I genuinely wanted to see.