The basic deal is that you need to have enough
software loaded to get your
hardware working, and then have your boot sequence be pointed to boot off the device.
The easiest way to get this done is to have a motherboard with BIOS support to initialize the device and BIOS support to boot from the device. All computers have IDE BIOS support and therefore allow you to boot from hard drives and CD roms. Newer ones have support for booting off USB keys.
So, assuming that you don't have software support in the bios, what can you do? Well get some hardware that can appear as an IDE device to your BIOS. I know that there are CF to IDE adapters out there that will do just that. Most of the USB to IDE hardware devices out there go in the opposite direction. They take something that is IDE and make appear as a USB device.
If you really what to make this happen with USB devices I would invest in a new MB that supports boot from USB.
Here is an example of the CF to IDE adapter
http://www.psism.com/adcf.htm
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