The Joker is Batman's no. 1 arch-enemy and appeared in the very first Batman comic book in 1940. Here's a little history on the comic book Joker (from Wikipedia).
Detective Comics #168 (February 1951) revealed that the Joker had once been a criminal known as the Red Hood. In the story, the Red Hood falls into a vat of chemicals while escaping from Batman. He emerges with white skin, green hair, and a bizarre grin.
Though many have been related, a definitive history of the Joker before the chemical bath has never been established in the comics, and his real name has never been confirmed. The most widely cited backstory can be seen in The Killing Joke. It depicts him as originally being an engineer at a chemical plant who quits his job to become a stand-up comedian, only to fail miserably. Desperate to support his pregnant wife, the man agrees to help two criminals break into the plant where he was formerly employed. In this version of the story, the Red Hood persona is given to the inside man of every job (thus it is never the same man twice); this makes the man appear to be the ringleader, allowing the two criminals to escape. During the planning, police contact him and inform him that his wife has died in a household accident.
Stricken with grief, he attempts to back out of the plan, but the criminals strong-arm him into keeping his promise. As soon as they enter the plant, however, they are immediately caught by security and a shoot-out ensues, in which the two criminals are killed. As the engineer tries to escape, he is confronted by Batman, who is investigating the disturbance. Terrified, the engineer leaps over a rail and plummets into a vat of chemicals. When he surfaces in the nearby reservoir, he removes the hood and sees his reflection: bleached chalk-white skin, ruby-red lips, and green hair. These events, coupled with his other misfortunes that day, drive the engineer completely insane, resulting in the birth of the Joker.
The story "Pushback" (Batman: Gotham Knights # 50-55), supports part of this version of the Joker's origin story. In it, a witness (who coincidentally turns out to be Edward Nigma, a.k.a. The Riddler) recounts that the Joker's wife was kidnapped and murdered by the criminals in order to force the engineer into performing the crime. In this version, the pre-accident Joker is called Jack.
No recounting of the Joker's origin has been definitive, however, as he has been portrayed as lying so often about his former life that he himself is confused as to what actually happened. As he says in The Killing Joke: "Sometimes I remember it one way, sometimes another... if I'm going to have a past, I prefer it to be multiple choice!" In Arkham Asylum: A Serious House on Serious Earth written by Grant Morrison, it is said that the Joker's insanity runs so deeply, that he recreates himself every day. He could have a different personality with different quirks and mannerisms whenever he sees fit.
A 2007 story arc in Batman Confidential, written by Michael Green, shows a pre-transformation Joker giving his first name as "Jack". This story shows Jack as a career criminal, specializing in the circumvention of advanced security systems as well as having a skill in murdering that Batman describes as "gifted".
Apparently, "The Dark Knight" is also going to have something about the Joker's backstory and history.
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