Couldn't resist this meme from melissima, who left a lovely comment over at Numb3rs Don't Lie.
http://melissima.livejournal.com/28302.html#cutid1 Personally, mine are:
Chiwetel Ejiofor: It's the voice. The man could read from a phone book and have you wanting to rip his clothes off.
Zoe from Firefly/Serenity
Robert Carlyle: yes, I know - skinny little b*stard, but he just does something to me
Ah, Willow
Jonathan Rhys Myers, again it's the voice - Irish accents just do it for me.