How many computers can I hook up my iPod up to?

Question

It seems to me that I read something (months ago) about only being able to hook my iPod up to one computer (lifetime) from which I can download my music, yet I also heard that you can load your music library (purchased music) on 5 compters lifetime. If you try to load your music onto a 6th computer, you will be told you cannot and that you have to re-purchase the music.
Which one of these is correct?
Gateway   Windows XP  
Gateway   Windows XP  

Answer 1

See: How to Transfer Music Between the Computer and iPod
And: Transfer music manually
The iPod offers three ways to transfer music from your computer. You can select one of the following update modes from the iPod Preferences menu in iTunes (Edit=>Preferences=>'iPod' tab):
1) Automatically update all songs and playlists. This is the default mode, in which your entire music library, including playlists, is automatically synced to your iPod. If the music library on your computer exceeds the iPod storage capacity, you are prompted to select a different update method.
2) Automatically update selected playlists only. With this option, iTunes automatically copies the playlists you have selected to the iPod when you connect it to the computer.
3) Manually manage songs and playlists. You can also choose to transfer music to the iPod manually. This allows you to drag and drop individual songs and playlists from iTunes to the iPod.
Manage the iPod either Manually or via Selected Playlists.
How to Create a Smart Playlist
Deleting Songs or Playlists from your iPod
This is what sometimes happens when you delete that special playlist that iTunes created for you:
iPod cannot sync because one or more playlists no longer exist