Well...DH learned today that there is a new grant, he'll have funding for another year with a substantial raise, AND the shuttle launch is postponed so I won't have to take DD out of school. YEEEHAH! It looks like we'll get to "return to flight" after all! Sorry to celebrate when so many of you are diasppointed, but we sooooo wanted to go, especially after seeing the Columbia launch and then the awful aftermath. I am psyched!
Regarding taking a 3yo to KSC, I would say that as long as he can be reasonably quiet during the bus trip so others can hear the tourguide, you should be fine. Every 3 seats or so there are TV monitors so you can hear the tour. At the visitor's center, the observation gantry, and the saturn V hall there is plenty of space for him to roam thru and investigate, so I think he'd be fine.