Ask HN: What do you want in a knowledge base/bookmarking service?

Think Pocket, Instapaper, Evernote, Pinboard -- what is the biggest hurdle to reaching your perfect digital knowledge base?

On another note, what is the best way to make such a service more social, as to foster the diffusion and evolution of different ideas?

The biggest hurdle is that all of my data is already in too many different places. That's not entirely avoidable because my involvement with various employers, projects, etc. makes it so.

I think for everybody who wants to use a SaaS there are 10 people who want to make another one. If you want to make a product that sticks out, maybe it should be a desktop app, something that lives in the user's own cloud, etc.