I still haven't got a good combination going.
I use dropbox all the time for saving and sharing files mostly, and for syncing between various devices as a secondary use. But for note-taking and resource collecting? Nope. I just can't seem to settle on anything.
The problem is, I still take a massive amount of notes by hand (and I'm rubbish at filing them as well

), so when I do try to gather resources and make notes digitally, I never do it enough to get into a useful routine.
I tried using DevonThink for a while (
http://www.devon-technologies.com/products/devonthink/), but I can't sync it with a windows machine. Ideally I want something I can install on as many machines as I want, cross-platform, and have all my resources and notes wherever I want them, whenever I want them, but in a more organised and complete way than something that is simply file sharing like dropbox. I'm not sure such a beast exists though.
Problem is, I start using a new thingymajig, do some work using it, then decide I don't like it and either forget about what I've got stored there, or can't be bothered to import everything to the next thingymajig I try.
This digital lark is sometimes more faff than it's worth.