It's a relatively straight forward process to get OS X running on a NetBook like the Dell Mini 9 or the MSI Wind. You just need the freely available hacked version of OS X (Leopard) a replacement Wi-Fi card (internal) and a 4GB USB Flash drive or external DVD drive. I've actually had the pleasure of playing with a Wind that had OS X installed. With 2GB of RAM it was surprisingly peppy. The only issues I recall was with sleep/resume and something about the audio ports needing to be manually switched depending on whether you wanted to use the built-in speakers or headphones for sound.
But it is a violation of the licensing agreement for OS X and I will not do that.