[Roderick Usher]

Here's what good ol' Wikipedia says on the subject - lots of documentaries and quite a few I've never heard of, but an impressive list

0-9
1991: The Year Punk Broke (1992)
24 Hour Party People (2002)

A
Afro-punk (2005)
American Hardcore (2006) Paul Rachman
Another State of Mind (1984)

B
The Blank Generation (1976) Amos Poe
Blank Generation (1980) Ulli Lommel
Burst City (1982)
Boston Beatdown (2004)
Breaking Glass (1980)
Bilo jednom... (2006)

C
The Clash: Westway to the World (2000)
Class of 1984 (1982)
Class of Nuke 'Em High (1986)
Cop Killer (1983)
Crash 'n' Burn (1977) Ross McLaren

D
The Decline of Western Civilization (1981) Penelope Spheeris
Dogs in Space (1987) Richard Lowenstein

E
Ebba the Movie (1982)
End of the Century: The Story of the Ramones (2004)
Ex Drummer (2007)

F
The Filth and the Fury (2000)

G
The Great Rock 'n' Roll Swindle (1980) Julien Temple

H
Hard Core Logo (1996)
Hated: GG Allin and the Murder Junkies (1994) Todd Phillips
Hype! (1996) Doug Pray

I
Instrument (1998) Jem Cohen

J
Jubilee (1977) Derek Jarman
Jesus Christ Vampire Hunter (2002) Lee Demarbre

L
The Last Pogo (1978) Colin Brunton
Ladies and Gentlemen, The Fabulous Stains (1981)
Liquid Sky (1982)
Loren Cass (2006)
Luster (2002) Everett Lewis

N
New York Doll (2005)
Night of the Demons

O
Outsider (1998)

P
The Passenger (date unknown)
Population: 1 (1986) Rene Daalder
Punk Rock Holocaust (2003)
The Punk Rock Movie (1978) Don Letts (also known as The Punk Rock Movie from England)
Punk's Not Dead (2006)

R
Rad (film) (1986) Hal Needham
Refused Are Fucking Dead (2006)
Repo Man (1984) Alex Cox
Return of the Living Dead (1985)
Rise Above: A Tribe 8 Documentary
Roadkill (1989)
Rock 'n' Roll High School (1979) Roger Corman
Rude Boy (1980)

S
S.F.W. (1994)
Scenes From Oblivion (2008)
She's Real, Worse Than Queer (1997) Lucy Thane
Shock Treatment (1980)
Shooting at the Moon (2003) Jesse Richards
Sid and Nancy (1986) Alex Cox
SLC Punk! (1999)
Smithereens (1982) Susan Seidelman, Richard Hell
Straight to Hell (1987) Alex Cox
Suburbia (1984) Penelope Spheeris
subUrbia (1996)
Summer of Sam (1999)
Surf Nazis Must Die (1987)

T
Tank Girl (1995)
Tapeheads (1988)
Terminal City Ricochet (1990)
Terror Firmer (1999)
There is No Authority But Yourself A documentary about the history of Crass - (2006) Alexander Oey
Thrashin' (1986)
Threat (2006)
Times Square (1980)
The Punk (1993)
Tromeo and Juliet (1996) A punk version of the Shakespeare classic, co-written by James Gunn

U
Up In Smoke (1978)
Urgh! A Music War (1981)

V
Valley Girl (1983)
Vennaskond. Millennium (1998) Tõnu Trubetsky

W
Was Tun, Wenn's Brennt? (2001)
Wassup Rockers (2005)
We Jam Econo (2005)
We're Outta Here! (1997)
Westway To The World (2000)
What We Do Is Secret (2008)
Wild Zero (2000)

X
X: The Unheard Music (1986)

Y
The Yo-Yo Gang (1992) G.B. Jones