I bought a Thinkpad W500, kwin works flawlessly with the radeon/fglrx driver for the FireGL V5700.
The Intel GMA 4500HD works but I haven't figured out how to get desktop effects with this card.
I enable one card OR the other (not switchable) in the bios to prevent the ATI card running at full clock speed with no driver in the background as has been reported when the switchable option is selected.
It appears to be a common problem that full screen flash video suffers tearing under Linux, it's not a problem with Win7
(Yes I have "Use VSync" checked)
Everything works out of the box, including WiFi, webcam, thinkpad buttons and Function key controls.