I've been looking for something like this I'll definitely check it out when I get home. One small feature request that I have though is if you could add some simple screen-shoting functionality. I believe it should be simple enough judging for example by this SO question http://stackoverflow.com/questions/12823489/how-to-take-regi... and this example https://developer.apple.com/library/mac/samplecode/SonOfGrab... but I might be wrong. I realize that I could just use whatever screen-shoting app and then drag the image over but sometimes I take a lot of them and all the switching gets really annoying.
You can take a screenshot with the standard OS X shortcuts (Command-Shift-3, Command-Shift-4, etc.) then paste into a text cell. Quiver lets you save images inside text cells, including web images (which will be saved locally so they work offline).
If you like a quick workflow, use Command-Control-Shift-3 to take a screenshot and save it to clipboard, then paste in Quiver.
If you like a quick workflow, use Command-Control-Shift-3 to take a screenshot and save it to clipboard, then paste in Quiver.