Anyone know how to use their Android Phone as a Bootable USB Drive?

I have a Droid Phone and purchased a 32 GB SD card for it. I would love to be able to stop carrying the Bootable Flash Drive that I use to troubleshoot PC's (and often forget to bring, or leave when I am done) and instead carry a small USB cable that I can attach to my Droid and use that to boot to Yumi.

Has anyone figured out how to do this yet?

get an http server for the Android.
See: http://etherboot.org/wiki/httpboot

I planned to do an instructable of it, but I do not have android.
I don't think the phone can act as a USB bootable drive. But there are small USB SD card adapters so you can pull the SD card from the phone and put it into a very small, keychain sized adapter.