Is boot camp an utility that allows you to run Windows and Mac OS x at the same time?

Boot Camp is designed to help people setting up Windows operating system under back as dual boot solutions.

Running Linux under Mac is a bit more complicated, there are other solutions of Mac/Linux (dual boot) Mac/Windows/Linux (triple boot).

Installing Linux on a Mac with other operating systems on board requires advanced knowledge (especially boot loader [rEFIt] and Linux kernel compiling).