I have a Dell Mini 12 netbook. It has a 1.66 Ghz Atom processor, 1 GB RAM, Intel GMA 500 Graphics and a 60 GB (4200 rpm) pata hard drive. Its a slow netbook.
Windows 7 with Aero is slow on the machine. I find that the system gets more usable if you disable Aero, and the theme engine.
I bought this netbook with Ubuntu, which turned out to be the Ubuntu netbook remix. I wanted Ubuntu, which resulted in me trying to install Ubuntu (8.04, 8.10, and 9.04). I couldn’t get X to give me the 1280x800 resolution. The system has an Intel GMA 500 (like the Dell Mini 10) which has an X driver, but its broken.
Until that gets fixed, I’m stuck with Windows, and its almost usable with Aero turned off.