I often print the interesting nodes and read off-line. Now I am in habit of storing such node-pages and reading when I get time even after 2-3 months. I make marks on the pages, for the items in form of circle,lines, underlines etc and then re-read them as and when require at later time. I often mark things with additional words, such as 'Book' or 'Module' etc..

Questions:
1. Have you seen or developed any standard methods for 'marking things' on paper. Let me know too, if you suggest one, yourself.

2. Is it possible to have online -marking system ? Any external tools or perl modules would be useful. ( I see the possibility with SVG). Another possibility would be to convert the document to an image file and make circles using a paint program and integrate with version control system, just in case of someone asks.
An internet version would be better as I can access it at different places.

Thanks,
Aritst.