The Batman is 70 years old today. Batman was DC Comics second superhero after Superman and is one of the most popular comic book superheroes ever. Batman made his debut in Detective Comics #27.
In 1990, Batman creator Bob Kane was interviewed on National Public Radio. Kane drew Batman from its inception in 1939 to the late 60s.
And here's an interview with Bob Kane discussing the drawing of Batman.
The creation of Batman is not a story without controversy. Bill Finger was Batman's co-creator. However, because he was under contract to Bob Kane and not National (DC) Comics his work went uncredited. comic book memorial for Finger is here, and a wiki entry about him is here.
Finally, here is an interview with Batman comic book artist Neal Adams: