Kurt Vonnegut provides a set of eight rules for writing a short story in his book, Bagombo Snuff Box: Uncollected Short Fiction. I've been using the fourth rule to do quick edits of my evolving WIP. The rule is:
"Every sentence must do one of two things—reveal character or advance the action."
I've found this to be an extremely potent rule for expunging superfluous content from my first drafts.
How about you? Do you have any useful quick-and-dirty editing devices for improving first drafts?