Any way to see what I have recorded already as I peruse the program guide?

This may be already available and I have just not found it…but, I would like to have a flag that is set if a movie/show is in the guide and I have already recorded it. I find that I have been setting movies to record that I already have! I dont have but about 200 movies so far, but it is already an issue for me. Anyone have any hints or tricks? TIA!