I investigated running a lightweight operating system on my Netbook to get off Windows XP. I looked at Ubuntu Net Remix and Moblin but consider their simplified interfaces too restrictive.

http://www.greenlivingpedia.org/Kubuntu
My overall impressions are that Kubuntu Karmic Koala 9.10 is polished, easy to use, stable and quite slick. For those thinking of moving from Windows XP or Vista, this is a compelling option.