The Printliminator bookmarklet lets you selectively remove any element from a web page to make it printer friendly in just a few simple clicks.
Drag the Printliminator bookmarklet to your browser's bookmark toolbar, then just click it whenever you want to print a page but don't want to waste ink on extraneous ads and other page content. As you can see in the video, using the Printliminator bookmarklet to eliminate unwanted content is as simple as clicking on whatever you don't want. If all you actually want is one element on the page, just Alt+Click (or Opt+Click on OS X) that one element and everything but that will disappear. Other than that, there's not much to it. Click the Print icon once you've got things looking how you want, and you're good to go.
This isn't the first bookmarklet of this kind, but it's nicely made and works like a charm. Printliminator is a free browser bookmarklet, should work in any browser.
Printliminator [CSS Tricks]