Hey guys, you should look at diamond.io, we're building something that is a tool to help you solve this problem and the problem of organizing information in general. Check us out!
Ahhhhhhh!
You're tackling a laudable goal, but it would help to link to a page with more technical details.
On top of that we try to get further accuracy by using user information to help us find the context. We call it a Personal System, a repo of knowledge and learned preferences heavily tailored around each individual user. We're just in beta now but definitely put your email down if you want to try it out eventually!
My personal feeling is that (A) you're totally right that we need better _personal_ organization systems, but (B) the bottom layer (tagging, schemaing, relationships) should not involve fuzzy processes but should be totally understandable by the average user.
I know (B) is a weird opinion though so I look forward to seeing how far you can get with (A) plus machine learning & whatever other tricks you guys plan:)
So for us, we very clearly distinguish "a user labelled this item" vs "we guessed it was this label".
I'll keep you posted!