One of the new features added in OneNote 2010 is the linked note taking. This is a great way to take notes and have OneNote automatically link back what you were viewing while writing those notes. You can read about it here:
Out of the box OneNote will link notes to Word, PowerPoint and Internet Explorer. However like many of you I use a bunch of different browsers and I wanted to point you to a Firefox extension which allows you to have linked notes to OneNote 2010. You can read about it here: Linked Note Taking extension for Firefox (direct .zip download).
A big thanks goes to Mao Chen!
Firefox will not load without errors with this addin...