well the good looking thing is the place to start
did you say you saw the ep w/o his shirt - what else do you need??
Okay Cole Turner, Assistant DA appeared in the first ep of series 3. He was pretty much wonderful and Phoebe was immediately attracted, or as she said maybe it was just nice to meet someone who isn't a college boy "More years, less hormones"
Anyway we (not the Halliwell's) find out almost straight away that he is not just a regular DA (pity about that, i think they should have done what they did with Leo and kept us hanging for a while) and it's almost sure that he's not one of the good guys.
Anyway he keeps hanging around Pheobe in later eps, finding ways to 'accidently' bump into her. He also has a list of her fave things so to her he seems pretty much perfect.
Anyway enough trivia for now, more later.