BOINC is an awesome piece of software that lets you donate your computer’s processing power to a variety of worthy scientific causes. Unfortunately, if you’re running it on Linux without a graphical interface, the control tool’s documentation is a little lacking.
So here is a miniature howto on getting started with BOINC from the command line. I’m assuming you have a recent version of Debian or Ubuntu and a passing familiarity with how BOINC works (if not, browse the official site).