I consume more information offline than online .. I think.
Plan to make this a desktop utility as well, something that integrates with the desktop that allows you to right-click and "Zukmo" any given file. Even if you have to fake it by copying files to a temp directory and later sync them with your servers (why? better keep it private on users' machines.)
You will need integration with (MS|Open) Office sometime in the distant future.
Call Insync and see if you can integrate with their clients:
P.S. Nice clojure-like logo :-)