I've been meaning to mention this for days, but the time keeps running away from me. Go over to the Orbit blog and check out A. Lee Martinez's column about "Silly Fantasies." I might quibble with one or two points he makes, but by and large he reflects my current thinking about genre pretty closely. (The writing philosophy I've developed over the course of the last year or so can be boiled down to "Cheer up and have fun.")