The long-running TV series "ER" will go bye-bye at the end of this, its 15th season. Here's a list of some of the series' most notable guest stars over the last 15 years. I'd forgotten how many great actors did guest bits on ER -- probably because I stopped watching the show several years ago. For many years, though, I thought it was the best drama on TV.From Wikipedia.Memorable ER guest
