I tunes all the way, my house is entirely Mac based so everything is shared from my phone to my computers to my tvs. I hate that they change the formatting of it every year, but I always adapt and see that it was for the best
I've been looking into getting a TimeCapsule to back up all my music and movies to help my houses Mac run more efficiently. I don't have Apple TV yet either, we are have digital cable.
Folders + Winamp. I've read Winamp doesn't offer the best audio quality, I've tried Fubar2000 for a while, but it's way too complicated. I find it so much easier to organise my folders directly in Windows
same here. i use winamp since windows 95. no idea i got stuck with it. maybe other players are better i dont know