Catching up on my feeds, I saw this funny video video in a post by Denver-based early stage investor Brad Feld. It compares the Lenovo X300 to the MacBook Air. I bought an Air a few months back and when my own (much larger) Thinkpad died at our Philly codejam I switched to my Mac. My whole Apple-happy team was disgusted that my Air had been sitting in my backpack unused all week long.
Now that I've switched to a Mac, I doubt I could go back to Windows as a primary desktop. I use my Air to remote control the headless Windows servers in my house, so I have access to anything I need.