My X300 is, bar none, the best laptop I've ever used. Unlike the MacBook Pro or T-series laptops (my previous all-around faves), it doesn't attempt to be a desktop replacement, but it's worlds more capable as an all-around travel computer than the Air, due to the internal optical drive, onboard Ethernet, and numerous USB ports.<p>The 301 looks like a very minor, but worthwhile, upgrade.<p>Of course, the fact that the Air runs OS X, while the X300 runs Windows or Linux, will make the decision all by itself for most potential buyers. Personally, I find that the X300 running Ubuntu makes for a nearly ideal mobile development system.