Liliputing

Install Windows XP on a netbook (USB stick method)

Update: Before you try all of this, you may want to try using WinToFlash, a utility designed to create a bootable Windows flash drive for Windows XP/Vista/7/Server. If this works for you, you can skip ...
Engadget

Boot XP from external USB drive without Boot Camp

jarpy has an interesting post up on installing Windows XP to an external USB hard drive without using Boot Camp to repartition his internal drive. This method makes use of the Open Source rEFIt ...
Indiatimes

How to boot Windows XP from USB flash drive

To boot Windows XP from USB drive, make sure that you have at least a 4GB USB drive (8GB is better). It should be a good quality drive, with a good access speed. To boot Windows XP from USB drive, ...
Ars Technica

Booting XP on a USB drive with Dell Latitude D610 laptop

Apparently this laptop isn't giving me as much latitude as you might think. I've tried running XP on a SATA drive in a USB enclosure. It was giving me blue screens when loading so now I have done a ...