I absolutely love the keyboard on my Lenovo Thinkpad T61 laptop. It's like butter. I remember the T40 keyboards were great, too. I can't type on other laptops now, especially MacBooks.

Also, I thought that the Apple keyboard that shipped with the G5 iMacs (it is white) is dreadful. But the lenovo keyboard is my best friend. Also I find the new silver keyboard that comes with the intel iMacs to be a pleasure.