Just thought I would chime in here...As much as I love SW, I have already booked our October trip to WDW on Jet Blue. Jet Blue has their flight schedule released out to (I think) October 30 right now. I booked about two weeks ago and got $59 going down, $69 coming back - both non stop.

Their prices are up a little now (just checked and same flights for our dates are currently $89 each way). With Jet Blue you do have a change/cancellation penalty of $100, but if you are certain of your dates, the pluses are you can use the Resort Airline Checkin service...and there are tv's in the backs of the seats onboard, oh, and one more tiny thing: the checkin area for Jet Blue is not as far along in the BUF airport as SW.
We tried Jet Blue for the first time in Oct 2008 simply because we could use the RACS service and really liked it. We flew down SW, then back on JB.
IMHO it is a PITA to drag luggage ourselves to the bus then through MCO to the baggage checkin for SW - did not miss that one bit