OneNote 2010 which is included in Office 2010 is an amazing note taking application with tons of features. It acts very similar to notebooks. One of the useful feature is saving the notebooks created in OneNote 2010 as PDF files. You can save the current page or a section or the complete notebook as a PDF file for sharing.
To save the Notebook or a page as PDF, click on the File tab in OneNote 2010 and then select Save as option. On the right side, you can see option to save the page as PDF, section as PDF as well as Notebook as PDF.
Once you have select the save as option, click on the button Save As available below. Each section would be created as a new page in the PDF file.