This is an idea whose time has come. I've also seen Evernote used as a game distribution platform [1-2].

With how much Evernote is expanding as a platform and as a way to store and index information, maybe the next threat to Google isn't Facebook but Evernote itself.

[1] http://flowandzonegames.com/break-bad-habits-addictions-card...

[2] http://flowandzonegames.com/hypnotic-visions/

EDIT: Was Postach.io a bookmarking app in it's past life (and a pretty good one too)?