Have bought a Samsung N510, which is technically slower than the MacBook (Atom N280 vs Core2), but it's also half the weight, double the battery life, and since I have a good desktop PC at home, I'd rather have the portability than the power. Also, I can get the Samsung new for the amount I can sell the MacBook for second hand, which is important given that I'm generally a bit skint these days.
The new laptop has the nVidia Ion LE chipset; this is notable because the "LE" version is crippled, but purely in software. I've hacked up the current nVidia drivers to enable the full power (well, as much power as the non-LE version gets). Might be of interest to anyone else who has a laptop with a "Ion LE" chipset, anyway..
Here's a link: http://www.zshare.net/download/740159720a658a85/
It's based on the 195.62 drivers; I might release newer versions as time goes by.
(Info on how to do it was found on the http://myhpmini.com site.)