Books Similar to The Dresden Files
Read Mike Carey's Felix Castor series (start with The Devil You Know). It's very similar to The Dresden Files (in the same genre) and I would argue as close as you are going to get to The Dresden Files without being a complete rip-off. You've got the hardboiled detective thriller story merged with the supernatural. The hero is a freelance exorcist in the vein of Harry Dresden though with a lower power level.
Another series that's got a lot of similarities to The Dresden Files, one that's got a lot of dark humour and visceral action is Sandman Slim. Like Dresden Files, it combines hardboiled detective fiction noir with the supernatural. The main character himself has a lot of comparisons to Dresden. It seems to be a series with the sequel to Sandman Slim already out.
You should also check out Simon Green's Nightside -- a series very similar to The Dresden Files, though much more over the top and far less "dark." The hero is sort of a supernatural private detective and operates in London where the supernatural coexists right alongside the natural world. Both of these series will be right up your alley if you enjoy The Dresden Files.
Finally, if you want to venture out of the urban fantasy setting and into the epic fantasy zone, check out Butcher's Codex Alera.