I like the ongoing nature of a blog - and have kept mine up 'cause there are people who read it I keep telling myself that if I were more consistent with my educational blog, people would read that too, but it hasn't happened yet.
I also like setting up a Google automatic search for terms, which is how my blog got found its first day and got a comment (totally floored me!). When I was shopping for a Dahon I put that in and then added Xtracycle. So now I get a couple links a day to people who've said that in a blog somehwere, so I can return the favor of saying "hi! you go dude!" from out of the blue.