A Micropoint Lunar M300. It's five years old, but I've had it for two. The hardware is one par with the mini laptops, it's just a lot bigger. It runs Windows XP and it's blue. The casing I mean, not the screen.
Before that I had some ancient Lifebook. I had 64MB RAM up until 2007, can you imagine the horror? It was a very reliable system and I was kinda sad when I had to replace it. I still use the Lifebook's powersupply, because the one from the Lunar tried to set the house on fire. My carpet has a burn mark now...
When I get a new notebook it will likely be a MSI Wind. It got a lot of great reviews and has an active community, so it's easy to get technical support. My Lunar has a fairly big screen (yay!), but it's far from lightweight. A Wind would be so much easier to carry around and it won't affect my AS! I'll still keep Lunar and turn it into a dedicated Soramimi Karaoke machine or something.