If you like documentaries and wonder what some good recommendations would be here’s a great list. 
I complied it form the suggestions made to pal Jesse Epstein, a wonderful documentary filmmaker in her own right (see the hilarious Wet Dreams and False Images) and founder of indie filmmaking network Shooting People who was looking for good introductory films for some students on Facebook. Here’s the list her friends suggested. I’m guessing many of these suggesters are documentary filmmakers too:

No Lies
David Holzman’s Diary
Dark Side of the Moon
Brother’s Keeper
American Movie
In A Dream
The Cove
Boys of Baraka
The Life and Times of Alan Ginsburg
(the 2nd DVD includes interviews w Johnny Depp and Patti Smith)
It Might Get Loud
Bueno Vista Social Club
Man on Wire
Wild Parrots of Telegraph Hill
 Hoop Dreams
 The Thin Blue Line
 Super Size Me
 Mad Hot Ballroom
 Spellbound
 Born Into Brotherls
 Food INc
 Dogtown and Z Boys
 The Fog of War
 Sicko
 Salesman
 Grey Gardens
 Harlan County
 Seventeen
 Capturing the Friedmans
 Both seasons of This American Life
 Obstructions
 Breaking the Waves -lars Van Trier
A Portrait of Idi Amin – Barbet Schroeder
Control Room
Nanook
Medium Cool
Roger and Me
Operation Filmmaker
Some Kind of Monster
Anvil
Short films by first time filmmakers:
The Foster Parent of Iron

The Mighty Quapaw

The Rest Haven

Aurelia – Mother , Teacher Survivor from South Africa

Jikeleza

Joan Rivers: A Piece of Work
and my personal favourite film of all time:
Paris Is Burning by Jennie Livingston

Anything by:
Barbara Koppel
Werner Herzog
Errol Morris
Maysles Brothers
Fred Wiseman

Suggestions: Michael Green, Nara Garber, Matthew Kohn, Rosemary Siciliano, Rebecca Richman Cohen, Kasia Kowalcyzk
Mary Kerr, Randi Cecchine, Beverly Seckinger, Adam Schartoff, Melisse Seleck, Chandler Griffin, Nadav Zohar

((tags: doc, documentaries, great documentary recommendations, films to watch, best docs, Jesse Epstein))