Until you get into the beta (or the produce comes out) I would recommend the following:
Word document processing - much neater than hand written and copies are easy, as is cut and past, including pictures, making diagrams, overlays.
HTML - for those willing to get into the tags and structure this can make quite an interesting journal, can also be shared. Overlays, hyperlinks, images, video and audio are all options when using html.
Wiki - good sharing if you can follow the basic structure, not as good as html (but you can code HTML into it). I nice distribution mechanism which I never really used too much.
OneNote/Evernote/collaborative notepad - is okay, can have links to pages, can make some of the collection of notes easier.
There are campaign notebooks out there as well, you can use the structure of one to get you started... 3.5 has quite a few associated with it.
Now none of these comes close to what Realm Works has promised, but it might help you start down the digital path and prepare you for the campaign manager.
I was once pen and paper only as well, now I use all of the above to some extent.