The current Apple TV has no hard drive. The original can be used to store and stream supported media over a local network through iTunes, but it cannot be used for storing programs or as a backup drive. An Apple Time Capsule does that.
That is up to Apple to decide.
Tim Cook, CEO of Apple, is a great spokesperson of Apple. Apple employs several spokespeople and has a phone number and email solely dedicated to media inquiries.
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There is no separate PC version of the Apple TV as it connects your TV to your network at home (usually wireless but can use an Ethernet wire) which can be used by Macs or PCs or both. You will need the Windows version of iTunes installed if you want to stream media from a PC to the Apple TV. (See links below)
The closest Apple-made software to Windows Media Player is QuickTime Player, which comes installed on every Mac.
Yes, Apple computers are the best for all media productions.
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iMovie
I recommend that you start by calling the Apple Media Helpline at (408) 974-2042.
The Apple iPad 3 is scheduled to be unveiled on March 7, 2012 at an Apple corporate media event. It should be available from the Apple website, Apple stores, electronic retailers, cell phone service providers and others sometime after that.
No iTunes only