Philly-bred Maria Yagoda - whose blog bio on snaxandsexinthecity IDs her as "a former Yale sex columnist, enthusiastic eater, philosophizer, and sandwich maker" - is out with a guide to South Philadelphia Vietnamese dining.
It's a Baedeker to the uninitiated, and by no means all-inclusive.
Yagoda details four mainstays - Le Viet, Nam Phuong, Pho 75, and Ba Le - and touches on Pho Ha, Pho Ta and Cafe Diem.
(I'd add recommendations for Mekong River for the vermicelli, Pho & Cafe Viet Huong for pho, and Cafe Cuong for the banh mi.)
The article is here.