This page is my wholly bad attempt to list all of the main key Batman comics.
Key books are usually first appearances, or when I major change for the title starts.
If they've been 'scratched through' then I've got them (Eventually this feature will be a bit more interactive, and by clicking on the title you should get photographic gloating), and some more information about why it is considered to be a key comic. So please bear with me while I figure out how to do this! And what body parts to sell to get the oldest ones.
Batman #681- Batman R.I.P. Climax (December 2008)
Batman #666- 1st Flamingo, Professor Pyg, The Weasel (July 2007)
Detective Comics #827- 1st Ventriloquist II, Peyton Riley (March 2007)
Batman #655 - 1st Robin IV, Damian Wayne, start of Grant Morrison's run (September 2006)
Batman #635- 1st Red Hood II, Jason Todd (October 2004)
Batman #609- 1st Hush (November 2002)
Batman #567- 1st Cassandra Cain, Batgirl IV (July 1999)
Shadow of the Bat #83- 1st Batgirl III, Helena Bertinelli (March 1999)
Shadow of the Bat #19- 1st Tally Man (October 1993)
Batman #497- The Breaking of The Bat (late July 1993)
Batman: Vengeance of Bane #1- 1st Bane (January 1993)
Batman: Sword of Azrael #1- 1st Azrael I, Jean-Paul Valley (October 1992)
Shadow of the Bat #3- 1st Amygdala (August 1992)
Detective Comics #648- 1st Stephanie Brown/Spoiler (August 1992)
Shadow of the Bat #1- 1st Mr Zsasz (June 1992)
Detective Comics #608- 1st Anarky (November 1989)
Huntress #1- 1st Huntress III, Helena Bertinelli (April 1989)
Suicide Squad #23- 1st Oracle (January 1989)
Detective Comics #592- 1st Cornelius Stirk (November 1988)
Detective Comics #585- 1st Ratcatcher (April 1988)
Detective Comics #583- 1st Ventriloquist I, Arnold Wesker & Scarface (February 1988)
Detective Comics #575- 1st The Reaper (June 1987)
Batman #404- 1st Commisioner Loeb, 1st Lieutenant Flass, Miller & Mazzucchelli's 'Year One' begins(February 1987)
Batman #386- 1st Black Mask (August 1985)
Detective Comics #546- 1st Onyx (January 1985)
Batman #357- 1st Robin II, Jason Todd (March 1983)
Detective Comics #523- 1st Killer Croc (February 1983)
Detective Comics #483- 1st Maxie Zeus (May 1979)
Detective Comics #478- 1st Clayface III, Preston Payne (January 1979)
Batman #307- 1st Lucius Fox (January 1979)
DC Super Stars #17- 1st The Huntress II, Helena Wayne (November/December 1977)
Richard Dragon, Kung Fu Fighter #5- 1st Lady Shiva (December 1975)
Detective Comics #411- 1st Talia Al Ghul(June 1974)
Batman #232- 1st Ra's al Ghul (June 1971)
Detective Comics #400- 1st Man-Bat (June 1970)
Strange Adventures #215- 1st Dr Daark, Kirigi & Sensei: The League of Assassins (December 1968)
Detective Comics #359- 1st Batgirl II/Barbara Gordon (November 1967)
Batman #189- 1st Silver Age Scarecrow (February 1967)
Batman #181- 1st Poison Ivy (June 1966)
Detective Comics #351- 1st Cluemaster (May 1966)
Detective Comics #345- 1st Blockbuster I, Mark Desmond (November 1965)
Batman #171- 1st Silver Age Riddler (May 1965)
Batman #156- 1st (Dr) Simon Hurt (June 1963)
Detective Comics #311- 1st Catman (January 1963)
Detective Comics #298- 1st Clayface II, Matt Hagen (November 1961)
Batman #139- 1st Batgirl I, Betty Kane (April 1961)
Detective Comics #267- 1st Bat-Mite (May 1959)
Batman #121- 1st Mr Freeze/ Mr Zero (February 1959)
Detective Comics #259- 1st Calender Man (September 1958)
Detective Comics #233- 1st Batwoman, Kathy Kane (July 1956)
Detective Comics #230- 1st Mad Hatter (April 1956)
Detective Comics #225- 1st Martian Manhunter (November 1955)
Detective Comics #184- 1st Firefly, Garfield Lynns (June 1952)
Batman #63- 1st Killer Moth (May 1951)
Detective Comics #168- 1st Red Hood I (February 1951)
Batman #59- 1st Deadshot (June/July 1950)
Detective Comics #140- 1st The Riddler (October 1948)
Batman #49- 1st Mad Hatter & 1st Vicky Vale (October/November 1948)
Detective Comics #108- 1st Batsignal (February 1946)
Batman #16- 1st Alfred Pennyworth (April-May 1943)
Detective Comics #74- 1st Tweedledum & Tweedledee (April 1943)
Detective Comics #66- 1st Two Face (August 1942)
Detective Comics #58- 1st The Penguin (December 1941)
World Finest Comics #3- 1st Scarecrow (Fall 1941)
Detective Comics #40- 1st Clayface I, Basil Karlo (June 1940)
Detective Comics #38- 1st Robin I, Dick Grayson (April 1940)
Batman #1- 1st Joker, 1st Cat(woman) (Spring 1940)
Detective Comics #36- 1st Hugo Strange (February 1940)
Detective Comics #27- 1st Batman (May 1939)
If I've missed one, or there is one that is not featured please contact the site!