HP Elitebook 820 works pretty well. Asus Zenbook UX21 works acceptably. But tellingly, after the news about the X60 last week or so, I decided to ebay an X61 and stuff as much RAM and SSD in it as possible. The X31 remains the greatest Linux laptop, the greatest laptop period, I've ever owned, modulo some graphics driver problems. I would like to see something with the build quality of these Thinkpads, coming with Linux pre-installed.