I have enjoyed a few recently published articles about parshat Vayera:
- Avraham and Kayin
- Hakhnassat Orchim: The Eternal Model of Abraham
- Vayeira's message to former Kiruv Professionals
- Where are you?
- Hinneni: Here I am
- Abraham's Greatest Trial (seen the first comment for another interesting point.)
- (Added the following week, but don't want to lose this link:) DovBear's notes on Vayera