http://www.nu2.nu/bootcd/
Bart's Way is the only way that I know of. Works well, but it's a bit tricky to put together and only works via CDROM.
I don't know of any BIOS that does a USB mount if that's the method you were hoping for...
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I don't care if you are black, white, purple, green, Chinese, Japanese, Korean, hippie, cop, bum, admin, user, English, Irish, French, Catholic, Protestant, Jewish, Buddhist, Muslim, indian, cowboy, tall, short, fat, skinny, emo, punk, mod, rocker, straight, gay, lesbian, jock, nerd, geek, Democrat, Republican, Libertarian, Independent, driver, pedestrian, or bicyclist, either you're an asshole or you're not.
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