Sorry if this is a really, really basic question but I've never really "gotten" the point of AppleTV from day 1. For someone who currently has DirectTV, and thus the ability to rent/buy movies (Netflix et al.) through DirectTV, what if anything would AppleTV give me that I don't already have? The only thing I can figure out so far is the ability to wirelessly look at iPhoto photos or play iTunes music from my computer. Is that it? I'm really clueless here.