The TV series based on Jim Butcher's Dresden Files series has started on the SciFi Channel. Harry Dresden is Chicago's only professional wizard; in the first episode, a kid seeks him out based on his ad in the Yellow Pages, saying that monsters are out to get him and his mom.
I've only read the first of the series, though I fully mean to get around to the rest. It was a fast and enjoyable first-person urban fantasy, and I recall thinking that the magic system had some nice touches.
The first episode was decent. I saw a comment that it had not been intended as the premiere, but I thought it was a reasonable introduction regardless, weaving together some of Harry's backstory with his present case. And even though I knew that Murphy the cop and Bob the spirit were recurring characters, I don't think that would have been hard to guess. I wasn't blown away, but I didn't roll my eyes much either. This isn't much my kind of thing on screen, but if it's yours, now you know it exists.
The episode is re-running throughout the week at various times, and at 8:00 this Sunday, with the next new episode to air at 9:00; you can also apparently watch it in full online. (At least one review I saw said that the second episode was much stronger, so we'll see.)
No spoilers for the books in comments, please.