I've been thinking about getting an Apple TV 2 but I have a couple of questions. 1. Does the Apple TV 2 receiver have to always be plugged into a Mac? 2. If it is not plugged into a mac, what functionality does it lose? 3. Basically, I'm happy to just use it as a receiver to play movies and streaming video and music from my iPad and iPhone on my TV. In other words, I just want to use it as a way of playing videos and music from my iPad and iPhone presumably via Airplay without the need for a mac. Is this possible? 4. I just bought an HDMI adapter for my iPad. Will having Apple TV 2 and using Airplay make this redundant? Thanks.