There are a lot of good suggestions here. I would like to second the ideas for Teddy Bear & Doll weekend and Flower and Garden. I am a Teddy Bear collector and "bearsmith" (one who makes bears) but haven't been for the weekend as of yet, and I always figure I am missing something at Flower and Garden.
My official suggestions would be more of the Behind the scenes tours at Seaworld. I enjoyed the Backstage at Believe when I was there and after hearing Pete discuss his tour, I really wish I would have spent more time on the tours. I don't think I would have understood the Believe show quite as much without having the back story they provided over lunch.
I would also like to suggest that perhaps Bob could do something which highlights each area of each park. Starting with the Magic Kingdom, perhaps and just covering what is offered in each area, talking about the theming, and the attractions, the best shady nap spots. This could help newer visitors as well as possibly highlight things that might have been overlooked. Not every little detail but perhaps more of "Bob's Picks" for each area. I suspect this would also spark some interesting discussion & draw out some trivia.
After the segment runs, we could also start a thread to share our thoughts and memories of the areas as well.