Lorelle and Samir both point to a number of plugins to do surveys within WordPress, but neither of them say any of them are that good. And Samir is pretty disapointed: “at the end of it all, I never did find my ideal online survey tool.”
Survey Fly is the best recommendation from both of Lorelle and Samir, but it isn’t WP2.5 compatible and was las updated in summer 2006. It’s also limited to tracking only one survey at a time. Ugh.