Since I don't want to mark series and movies as watched x2, x3 or even x10, I made this list of things that I found entertaining enough as to watch again. This doesn't mean they are my favorites.
shortest to longest running-time
While I rate most shows seriously and try to keep personal opinion out of them, these are MY favorites. I am aware that Ro-Kyu-Bu is not quality anime but hey, it's the best loli show ever...