In a bizarre way, I'm glad to see that I'm not alone. Misery loves company, right?
I am using a 15" MacBook Pro + 23" Cinema Display + new keyboard. My Dashboard and Expose keys are not working, but everything else is fine and dandy.
I was on the phone with Apple tech support this morning and they had not heard of the problem and after making me jump through some useless hoops (reinstalling update, running it though a test account, etc.) they said I'd have to do a full Archive & Restore of the entire OS. I basically told them "You can kiss my A$$!"
So it looks like this is a widespread problem with the new keyboard and MacBook Pro's specifically. I hope they fix this problem soon! The keyboard is really nice, but having 2 "broken" keys is not exactly the Apple experience I'm used to.