Sounds like a very cool idea!
You could download Evernote (
http://www.evernote.com) and import your
PDF's into Evernote.
You can even have Evernote watch the directory you are creating your
PDF's in and Evernote will import them automatically as soon as a PDF
is created.
Evernote can also recognise handwriting! (I'm not sure if Evernote can
recognise handwriting inside PDF's though). But It certainly can
recognise handwriting in image-files.
Actually, Evernote can do a lot more and it is free! Check it out :-)
Hans-Erik