Thomas Sheehan is one of the most cited Heidegger scholars and many of his papers have been posted on a faculty web site at Stanford. Sadly the site hasn't been updated for some five years now. I came across a recent paper of his a couple years ago that's also one of my favorites. It's titled Being, Opened-ness, and Unlimited Technology, but it is neatly summarized by the sub-title and the section titles.

Ten Theses on Heidegger
1. Das Sein = das "ist"

2. For Heidegger die Sache selbst is not Sein but that which makes possible the phenomenological occurrence of Sein.

3. die Sache selbst = die Welt, die Lichtung, das Da, etc.

4. Welt/Lichtung/Da occurs only with and as Da-sein, our apriori opened-ness.

5. Thus, in one formulation die Sache selbst is the apriori (= always already) opened-ness of the open-that-we-are, which makes possible all takings-as and attributions of "is."

6. Heidegger sholarship should abandon the word "Sein" as a marker for die Sache selbst.

7. What brings about Welt/Lichtung/Da is human finitude - the hidden, withdrawn lack that generates the open.

8. What Heidegger calls Seinsvergessenheit is the forgottenness not of Sein but what makes possible Sein and Seinsverständnis.

9. The intrinsically hidden lack/finitude that is responsible for the apriori opened-ness of the open guarantees both the groundlessness and the in-principle unlimitedness of our ability to take-things-as -- for example, in theoretical-scientific knowing.

10. The in-principle unlimitedness of takings-as and occurrences-of-being likewise makes possible unlimited technology.

I can post the sections if folks are interested.  ¶ 6:23 AM