I just signed up for Prime as well. I am pleasantly surprized the amount of videos and shows I get now. I also have NetFlix and Hulu+. Prime will probably be the last straw for broadcast cable leaving my house. I want to see how this up comming season plays out, but if I am able to watch the shows I want to, then I am turning off Cable TV and saving $100/month.
Something I have not tried, but with iPad miroring on the 3rd Gen, I wonder if it will stream to the ATV. Worth a try. Not fretting too much, my DVD player has Prime already.