I only care about how they feel. The old MPBs had a keyboard that was soft to the touch (eg. not "clicky"), there were no gaps between the keys and each key was curved to fit your fingers.

In contrast, the newer Macbooks and MBPs have clicky, flat keyboards. It takes much more effort to depress a key and even after a year of getting used to this I'm unable to type as fast as I could on the old one.

About the keyboard layout, I don't care what is printed on the keys. US-style wide enter key is fine, as is European style tall enter key. These things are pretty easy to get used to in my experience. Color, backlight etc. is not important.

What matters is simply how good it is to write on, especially after several hours and especially when typing fast.

I went from a Thinkpad T400 to an MBP, and I had no problem getting used to the keyboard, outside of the fn/ctrl/opt/cmd button placement. I'm not sure if any Thinkpads have backlit keyboards, but it's miles ahead of the Thinklight.

@OP: After switching, the MBP is a hands-down winner to me. That said, at twice the cost of a Thinkpad, it had better be..