That's awesome! 2 way sync with Pocket would be amazing, this is a much better reading experience on desktop and I can use Pocket for now if necessary on mobile. You'd also get the awesome IFTTT ecosystem Pocket is in if you're not going to be able to match that for a while, saving from Feedly to Pocket is awesome and it'd be great to get saved RSS in Dragdis too!

I was just about to edit in that I really like your focus on pictures, that's where what I currently use falls down badly. I can definitely imagine I'd save more images using this.

In terms of your desktop experience, would you consider one click (not drag) page saving? In your video it looks really tedious dragging from the URL bar to a sidebar on the right when you could just have a button to save in one click and categorise later.