Check out these little gems. Diskless notebooks preloaded with Linux and capable of running XP. Priced between $300 and $400 depending on built-in memory. All the usual I/O and expansion options plus webcam, less PCMCIA. A couple of guys I know got them for field work, and so far they rate them FFFF (ForumsForums Five Fumbs up).
http://www.newegg.com/Product/Product.aspx?Item=N82E16834220246
http://www.newegg.com/Product/Product.aspx?Item=N82E16834220246