Matt Murdock has a number of problems. First he is a attorney (well everybody has to eat), the second was the promise to his father that he would never use violence to solve a problem, the third and slightly more serious is that he is blind.
Despite these small, but significant, obstacles he has the urge to read the great cities of crime and avenge the death of his father.
How? Obvious really. One don's a red lycra body suit, with a DD emblazoned on the chest (ominously looking like the motif of a very bad fizzy beer that sparked that sparked the Campaign for Real Ale into life). Convince yourself that in the funny suit you are not Matt Murdock so can brain anybody you like, and that not being able to see means that you can fall from buildings and catch any stray drainpipes that you can't see, but will obviously be there.
Or at least that was idea for Marvel superwriter Stan Lee and artist Bill Everett in 1964. What followed were a series of ever more increasingly unlikely stories, drawn by an ever increasing range of artists, that kept the series alive, but never really hitting a high spot, even with the Black Widow as a partner from 1970, right upto 1979, When Frank Miller took over and turned Daredevil into a far darker character, though not necessarily improving the stories, before moving on to better things.
Daredevil is still in production and is shortly to be the subject of a film (14 Feb 2003)
Sources
http://www.toonopedia.com/daredevl.htm
http://www.1earth.com.au/comicbook/daredevil.html
http://www.gottawiz.com/Comics/Marvel/Daredevil/Daredevil.htm
http://www.geocities.com/cheeksilver/daredevil1.htm