Netbooks originally came with a form of Linux installed to keep them easy to use and cheap. Then models started appearing with Windows XP inside and that appealed to many consumers who snapped them up. It is often a case of the familiar (XP) versus the unknown.
Linux is a very powerful OS and Ubuntu is a great choice for netbooks due to its flexibility, interface customization, and its power. The folks at Maximum PC believe so too and have penned an excellent tutorial showing how easy it is to Become a Linux Netbook Power User. Their article shows the process from installing Ubuntu to optimizing the Linux caches for better performance. It’s a great place to start if you are considering installing Linux on your shiny new netbook.