Here are some further resources:
• One of the most vibrant publishers of short forms, Rose Metal Press has published a Field Guide to Writing Flash Nonfiction: Advice and Essential Exercises from Respected Writers, Editors, & Teachers (edited by Dinty W. Moore), featuring 26 writers examining the form and providing examples.
• Family Resemblance: An Anthology and Exploration of 8 Hybrid Literary Genres, edited by Marcela Sulak and Jacqueline Kolosov, has a healthy section on short-form nonfiction with contributions by Brenda Miller, Ander Monson, Patricia Vigderman, Sarah Gorham, and Bret Lott.
• Judith Kitchen’s popular anthologies of flash nonfiction include In Short, In Brief, Short Takes, and Brief Encounters.
• The Iota Conference on Campobello Island, New Brunswick, Canada (just over the bridge from Lubec, Maine), is “a celebration of…