I’ve written in a little bit of depth before about Organizing my research related reading.
My favorite piece of the puzzle is using the Post Kinds Plugin for WordPress which has some useful browser bookmarklets for quickly saving what I read, bookmark, and interact with online. Having the ability to add categories, tags, and other behind-the-scenes metadata also helps a lot.
You can then turn around and add all this to a newsletter at your leisure.
Happy to share more, but this should be a good start.