YES!! That happens to me all the time! Movie characters, TV characters, sometimes even book characters. Typically it's not the actor I have a crush on, more like the character he plays.
Currently, however, I can't get enough of...
Josh Harris, of Deadliest Catch. He's a real person (I mean, as opposed to a character), although I'm not sure we'd get along if I met him in real life. Which is probably good, since I'm married! But still... he is SEXXY!!
Gael Garcia Bernal
Here's a couple of mine:
David Tennant
Hugh Jackman
Jude Law
Ralph Fiennes
Sara Rue
Lauren Graham
Tina Fey
Kaya.