I am another who loves IT'S A WONDERFUL LIFE. I used to watch it every holiday season when I was a teenager. Oddly enough I have yet to buy the DVD of it and I have not seen the film in at least 10 years, I think.
By the way, little Zsu Zsu lives up in DR George and DR TCB's neck of the woods. The Hollywood Theatre in Portland used to show the film every December and would often have the actress attend the showing.