Here is who I see as I read the books. In some cases, there are height, hair and age discrepancies, but if Hollywood can fake it so can I. (Pardon spelling)
Dresden: Huge Jackman
Murphy: Judith Hoag
Molly: Jessica Biel
Micheal Carpeter: Gerard Butler
Mac: Patrick Stewart (Seriously, he like Mac never seems to age.)
Nichodimus: Liam Neeson
Thomas: James Marsters
Bob: It's a double up but either Marsters or Patrick Stewart
Marcone: Huge Laurie
Sanya: Christopher Judge
Shiro: Mako
Laura Wraith : Kate Beckinsale
Lea: Scarlet Johansan
Mab: Angelina Jolie
Elain: Terry Ferrel
Uriel: Morgan Freeman
Eb: Kris Kistoferson
Butters: Seth Green
Susan: Roselyn Sanchez
Odin: Clancy Brown
Carlos: Mark Consuelos
Everybody likes Marsters except me. He was descent as Spike in the one episode of Angel that I watched, but I'm not what you'd call a fan.
No way do I see Patrick Stewart as Bob. Bob is too raunchy.
He's also a little to lanky for my image of Mac.
Angelina as Mab? uhhhh... no.
Uriel is described as a young man, except in his Jake persona.
I also can't see Hugh Laurie as Marcone. He doesn't come close to having the right personality in anything I've seen him in.
Hugh Jackman is way too old for Harry, not to mention that I can't see him taking the beatings Harry takes on a regular basis.
Molly has the physique of a female Body Builder.
Mako might have made a descent Shiro but, unfortunately, he's dead.
Can't see Christopher Judge doning a Russian accent (Much as I like him)
Scarlet Johansen is too young for Lea.
Kristopherson I might agree with for Eb.
I might like Gerard Butler more if he could do more than one accent.
I don't see Seth Green playing Butters because I can't see him playing someone who gets caught up in other people's pain.
Liam Neeson is an interesting thought for Nic. I can see him doing the Villain very well, but the image is off somehow.
Whoever plays Lara Raith has to drip with Sex Appeal. She's the kind of person who expects men to succumb to her charms, and with good reason. She's only been rebuffed by two men in the last century. Tall, Graceful, Beautiful and Deadly.