Hands down the best laptop for linux in my opinion. I would be interested to hear if there are any other laptop lines with such a great history of linux support.
Certainly not the history. But in the modern world there is a pretty broad selection of nice devices out there. I just bought a Sony Vaio Z (SVZ131190X): 13.3" 1920x1080 screen, quad core ivy bridge, no discrete GPU, 8G RAM, 512G SSD, Intel 6235 Wifi, ultrabook form factor though not actually branded as one.
Almost literally everything worked out of the box on Fedora 17 (the sole exception being the card reader, which is supported by a staging driver Fedora doesn't put in its default kernels; rpmfusion has a kmod-staging package, or just build your own kernel).
I love it. The days of tricky Linux support in laptops are, thankfully, mostly behind us.