Apple.
Upgrading iTunes is free.
An Itunes account is free
The iTunes software is free, (See links below)
yes but it makes you device lag
on my itunes it says "Genius makes playlists from songs in your library that go great together with just one click"
19.99
$1.99
an album on ITunes will be about £7.00 depending on how old it is. I bought an old one for £4.99
Itunes tax is always being changed. As of August 2010 i can tell you it is about 15%.
No. Itunes does have to approve your podcast however and you may have production costs for your podcast.
Because itunes is a terrible program. Get winamp (a much better program to play and catalog music) and stop giving apple 60% of the money for the music that an artist makes. There are many other resources on the web that are much more fair to the musicians that you want to support.