In May 2003 and May 2004, DD15 and I vacationed at WDW starting with Memorial weekend (arriving Friday) and we usually stay 9-10 days. Considering that we used to go early Sept or early Dec, we found the crowds to be very manageable. I dislike crowds (malls, grocery stores, etc) and always time things to avoid them! Memorial weekend is a little busy, but it's much slower right before and right after that weekend. The weather has not fully gotten into hurricane season (though the humidity is beginning to rise and the afternoon showers are beginning). We really like going at this time. Keep in mind that the Flower Show is in full bloom (pun intended). Lots of schools have not started their summer break yet. Good time to go!