True, it is separate from MSoffice2003, but, you can run it on a labtop. You will not realize all the functions without a tablet, but you can type stuff in, organize notes, annotate notes, set up a schedule, search your notes, highlight text, etc. It is a great program.
You might also want to check out GoBinder. Smaller company without the name, but their whole company is centered around notetaking. Great customer service and a little more user friendly than OneNote and it will search text you import in whereas OneNote will not. The only downfall is, it is a little bit slower program (speed) than OneNote.
Both are very similar and it is amatter of preference.