Having bought the HP TP Bluetooth keyboard I can report that it has some TP specific keys - and its a lovely bit of kit too - should be for the price though. It really comes into its own if you have the Touchstone stand as well.
I think the keyboard was worth the money with its dedicated keys, and I second the TouchStone adding to it. I am just anal and would be damned if I would connect anything Apple to this! Just my opinion though.