Where do you want to go today?
SPODS who came up with a way of dual-booting Mac OS X and Windows XP on a Macinteltosh have added Linux to the mix.
Although you can't boot Linux straight from from Boot Camp, the open source OS can be 'chain loaded' from an installed copy of XP using a bootloader named LILO, say geeks at OnMac.net.
The website was launched in January to get propellorheads to find a way of booting Windows on an Intel-powered Mac and managed to do so just before Apple launched Boot Camp. Coders were then sent off to get the triple-boot thang happening, full instructions for which have been Wiki'ed
here.