Thanks to Xournal, you can now annotate any PDF and export it out to a new PDF. This is excellent for filling in forms, note taking, keeping a journal, writing using a stylus etc. I have just experimented it on my newly minted Fedora 12 machine and it just worked wonderfully. My set up has a Genius G-Pen 340 pen tablet plugged in via a USB port and it just all worked seamlessly. Kudos to all who make this happen!