Some good japanese movie are the battle royale movies, or the death note movies. and there is this good japanese korean combo called Fighter in the Wind. the latter is good if your feeling up for a fighter movie. well, how about your choice
I also like the Ring and to tell the truth it's better that American version. I also like Takeshi Kitano movies, they are all wonderful.
My all time favorite Japanese Movie is Love Letter and my favorite Japanese TV serial is Tokyo Love Story