There's a really detailed menu at AllEars. We did the Buckingham Palace, and it was very good. Our tea sandwiches were egg salad, chicken salad, tuna salad, and I'm blanking on the other 2. I think one was some sort of cucumber sandwich and one had shrimp. I don't eat seafood, so they doubled up on egg & chicken for me. The berries & cream were also excellent. You can call WDW Dining to make a reservation for it. We went right at 2 when they opened, since we wanted it to be our lunch, and that worked out well! They serve from 2-4:30 or 5. The room is really pretty where tea is served.
http://allears.net/menu/menu_gft.htm
Here's some pictures from when we were there:
Mmmm... looks yummy! I'm going to look into this, if the ladies don't love this, I know my mother will when I take her next year!