I haven't analyzed the MacBook too much. This'll be my first venture into one.
Honestly, I don't like the new keyboard design very much. The floating key layout appeals to me more. But I have heard of the keys/palm-rests cracking very easily. Thats disappointing.

When my dye comes in, I'll test it with an old iBG3 case I've got knocking around. I'm interested to see if that'll work myself.

Question that I'm not sure anybody has the answer to:
Do you think that an SMT LED below the white keys on the MacBook will show through correctly? I doubt it will but I figured I'd ask anyway.
I haven't been able to find any MacBook Air keyboards on eBay, and direct from Apple will probably be incredibly expensive.