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I'm skittish about owning another laptop. I'm using a Powerbook G3 now with OS X, but will eventually replace it to probably run GNU/Linux again. The trouble with laptops is, if a part breaks, it's very difficult and expensive for a do-it-yourselfer to repair (and expensive to get parts for).
My next "box" will probably have a fanless one of these in it: http://www.mini-itx.com/ with a standard laptop-sized 2.5'' IDE hard disk in it, and be able to be powered by 12 VDC or conventional AC (just like a laptop, with the right adaptor). Something rugged, modular, & built to last but easy to fix when it breaks.