This is a great idea. So much so that I have "Why didn't I think of that?" syndrome.

Here are a couple of suggestions that I could use if you're looking for feature requests. Most of these things exist in one place or another, but having them integrated into a one-tool workflow would be awesome.

1. Some kind of crowdsourced reputation system for sources (i.e. medical journal sites have high reputation, naturalnews.com has low)

2. Auto cross-referencing between articles based on content.

3. TODO list management

4. License-aware relevant image suggester (please!!!) This alone would be a killer feature for me. Pick out topic words and search selected image sites, then give me thumbnails to choose from.