Three options, from most expensive to least:
1. AppleTV - all your iTunes audio and video; With Airtunes and Airfoil, can stream Pandora
2. Airport express - need cable to go from mini jack in AE to optical in; Streams your music via Airtunes, and Pandora with separate purchase of Airfoil.
3. MediaLink - in my 4310 (check on the 3310), I can stream all my music directly to the AVR. Also works for photos. I know it does NOT work for video purchased via iTunes (DRM?). Not sure about other video, but probably would work.