I bought the 2005 trade paperback on sale last month in preparation for next month's animated adaptation. It tells the concurrent stories of Jim Gordon's first year in Gotham City and Bruce Wayne's first year as Batman, having returned to Gotham after martial arts training.
Most of the focus is on Gordon, keeping Batman a mysterious figure. We all know he becomes a great hero, I suppose, so that story didn't need to be told. Still, I would have liked more Bruce Wayne/Batman. Overall, I thought Miller did a better job rebooting Daredevil. His success there led to his being asked to reboot Batman. Then again, I find Matt Murdock/Daredevil easier to empathize with than Bruce Wayne.
Miller does succeed in bringing his hardboiled sensibilities to Gotham, and Christopher Nolan used many of his touches in Batman Begins and The Dark Knight. I wonder if readers picking up the TPB for the first time will find it as I did, too much backstory/establishment a la Star Wars I-III or Enterprise.
The comics run leaves a lot for the animated movie to fill in; I'm still curious to see it.