In my post yesterday, I suggested using "PDF Adder" to add PDFs to your iTunes. Duh. I neglected to mention that also in the PDF Adder collection is a PDF Service Workflow called "Add to iTunes...". When installed in your [username]/Library/PDF Services folder it appears as an option under the "PDF" drop-down in any app that supports a Print dialog. So, find a page in Safari, hit "Print" and select "Add to iTunes...". It will ask for a name, artist, and album for the PDF and then add it to iTunes.