I bought a ILap for my 15" MBP. It comes with the wrist cushion which make it comfortable to use my Mac. I have been comfortable with all of Mac's keyboards. The reason I use external keyboard for the rest of my Macs is to avoid wear and tear on the on-board keyboards. I use the ergonomically shaped MS Keyboard for my PC. It's comfortable as well; but, it gets too bulky for my taste.
Thanks for the replies, but I don't think we should have to use a book or some other product to get the keybooard to be ergonomic. Every other laptop I've seen (other than mac) has feet to tilt the unit up. Even my new mac keyboard is tilted. Oh well... When my new MBP 15 gets here, I'll see how much it bothers me or I'll just adapt.
I got something from best buy that is a small metal fold up thing. That's the best I can describe it. Folds up to the size of about 4 pens held in your hand. Puts an angle on just about any machine.