So often clients ask me for the ability to add an "email this page" or "print this page" option to their web site. Luckily, the print module does both these things - and more.
The module is a snap to set up and even offers the capability to print any web page as a PDF (using an external, free, open-source library). It has loads of options that allow you to tweak the position and language of the links and provides several theme functions that can be overridden so you can match the links to your site's theme.