I saw
paul wesley in cold case
michael trevino in cold case charmed Cowbelles. and 90210
nina in a movie (but not remember the name)
mrs lockwood in cold case
steve in without a trace
gina torres in gossip girl
david andres in heroes
matt davis in Urband Legend
malese jow in The Secret Life of the American Teenager
sean faris in reunion and Yours, Mine, and Ours
kelly hu - In Plain Sight

I've only seen Ian on Lost and in the movie Pulse (2006)
...and I've seen Paul somewhere too, but I don't remember the movie...
Oops, I was about to forget; David Anders on Heroes :)

Just remembered (I'm having a bad memory lately)*lol*
Michael Trevino in 90210

I've seen Paul in CSI:Miami .
And Malese Jow in unfabulous.

I've seen too Candice in Drop dead diva
and Ian in law & order Special Victims Unit

I've seen Paul in the OC the fallen and Beneath the blue
Nina in the American mall
Katherine Graham in 17 again
Michael Trevino in charmed