The most important piece of the last few days about Egypt, in my view, in this great reporting by David Kirkpatrick, Peter Baker and Michael Gordon in the New York Times. It's worth reading carefully because it represents the most detailed public account of efforts at defusing the post-July 3 crisis, negotiations between the army and the MB and how hardliners in the government nixed them, and gives some indication of key personalities around Sisi. It also provides details, such as that Mohammed ElBaradei meant to resign in late July after the second massacre of pro-Morsi protestors in Cairo but was convinced to remain by John Kerry. It's really sterling work.
One impression I came away reading this was that, while dynamics inside the Egyptian leadership were the most important factor, the interventions of Senators John McCain and Lindsey Graham may have prevented (because of their perceived arrogance from an Egyptian point of view) a breakthrough in efforts to avoid further violence.
Update: A source familiar with the negotiations / mediation efforts (not a journalist and not an American) confirms the NYT account is, small errors aside, largely correct but that the deal had already collapsed when McCain and Graham came to Cairo. Their swagger, at most, helped the Egyptian government in providing a pretext for nationalist backlash, but the decision had already been made to close the talks and move to a crackdown.
Below are links collated in the last few days, from different perspectives. I may come back to a few later.