I just signed up for this yesterday and I love what's going on so far. I'd been using Kippt for a while but since they stopped developing, I need something can rely on long-term and the self-hosted version of Unmark offers some protection against an exit by the founders.
Organising the information is still a problem that hasn't been completely solved yet. Bookmarking is a critical part of my curation workflow and I believe that curation will only continue to expand as a way to organise the web.
I'd love to know what others are using for bookmarking.
Hackerpreneur Magazine
Ballpark
Unmark for Chrome
Unmark for Chrome