I have a Dell XPS M1530 and I absolutely love it. It's ridiculously powerful, very well made, well designed, and built like a tank. However, it did seem like Ali was looking for something a bit smaller than a full size laptop.
A buddy of mine has one of the Asus EEE PCs, and it's pretty neat. I haven't used a whole lot, but it seems to work well. He's running Gentoo Linux on it, so I can't really say how well it run Windows apps, but it seems like it should be able to run most less demanding apps just fine.