I'm presuming you've researched tiling window managers as part of your work on this?
I've also considered a tagging system for links - bookmarks are honestly far too much manual management - I'd like a quick hotkey and a tagging interface possibly hooked up with a calendar. I'd be even better to group context from multiple sources such as emails, calendar events, web links and chat protocols so that for my 3PM meeting it could load a screen with all the context I need, allowing me to set up tasks beforehand.
While looting mobile for some our better interactions (Swipe gestures for OS X), I don't see how this is more efficient that what we have. Mobile work flows are far more convoluted and time sucking that current desktop models. This seems to introduce unnecessary steps, and is completely touch pad dependent. Tagging exists in modern OSes already, plus there's a strong use case for folders. There's a reason why dropbox is popular on iOS.