The hard drive died on my 11 month old imac. Fortunately it was still under warranty. I attribute the failure to handbraking movies 24/7 and disabling sleep (for streaming to apple TV). The hard drive was spinning non stop. This got me to thinking..... it would be cool to pick up an old G4 tower dedicated for itunes and streaming. That way if the hard drive crashes, I can just swap it out easily with another. My question is can it handle it? Say I have a 720p movie. Will the G4 choke streaming it to the Apple TV? I can get a 1Ghz for like $100. I'm sure it wouldn't be ideal for handbrake, but once we're done with our movie collection we don't planning on doing it very often.