Joe Walsh of Uptown market content has written a nice summary of the various methods of obtaining one way links. As expected, he mentions article submissions as the number one free method.

After you’ve done internet marketing for a few years, you start to realize that link-building methods are few and far between, and if you’re like most people, you need to achieve your objectives while spending the lowest amount of capital available. This article gives some tips that should be invaluable to the new internet marketer.