YWriter is a distraction-free, free organizing tool for writers.
I've played around with it a little here and there and found it to be really interesting. I think it's going to be really helpful as far as organization goes. At the moment my notes and ideas are scattered about in various small notebooks, documents saved on multiple flash drives, and in no way organized. Even if I happen to have a set of notes all in the same notebook, they aren't in order, and there's a lot of 'oh wait,' on my part and a lot of page flipping.
Anyway, it is not as detailed as Scrivener, can't do everything that Scrivener can, but it does appear to be a good alternative to try.