This thread's been quiet a for a while now, but I'll give this a go.
I'm kind of a hard core non-fiction reader. I've been working my way, I have to admit slooowly, through "The Death and Life of Great American Cities", by Jane Jacobs (who recently died).
Jane Jacobs should be the patron saint of bloggers--she didn't have any formal training in the field of urban design, but put the so-called experts of urban planning to shame by just studying how cities work in real life, instead of according to theory.
On the lighter side I read books about trains and streetcars, because I'm a nut for anything that runs on tracks.