Just visited in October 2010. (4th visit for me + DH, but 1st visit with DSx2)
Wonderful family holiday location.
Would really recommend the villa option - so convenient to have home comforts at hand and actually much cheaper than hotel rooms.
I booked one privately from this website and couldn't fault it. www.holidaylettings.co.uk/rentals/orlando/13180
It's a UK owner with fab facilities and loads of room. Even though there were only 4 of us, found it handy to have a bigger villa with lots of space to get some time out.
Booked a flydrive with Virgin - Top Tip - it's cheaper if you book 1 x adult flydrive to get the car and then book 1 x adult and 3 x child flight only, rather than book a family flydrive.
One word of caution - we spent a fortune before we went, buying 14 day Disney and 14 day Universal flex park passes as we though it would give us great flexibility (being able to go to any park, any day we wanted). We then spent two weeks being asked by DS(6) and DS(4) "do we need to go out? we want a day at the pool".
Don't get me wrong - they LOVED Disney and Unviversal parks, but they ADORED having their 'own' outdoor heated pool to splash about in all day. So we could have saved a bomb by not being so ambitious about our plans.
I'm so jealous - you are sure to have an absolute ball!!