I loved the Logitech Ultra X Premium flat keyboard. Perfectly washable in a dishwasher, sturdy and heavy enough to not wobble.
Now I’m enjoying the Macbook keyboard quite a lot as well. It took me a while to learn the function key combos that replace keys such as Home/End/PgUp/PgDown but after a while I find myself using those even on a full keyboard. And having the trackpad built in right under it is also very nice.
Oh, and I guess it would probably qualify as a shameless plug to mention my touch typing practice game Type Raiders, right? Check out www.typeraiders.com