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You can have as many as you want. But if someone already has an account, you can use your ipod/iphone on that account and won't take the songs on that persons account. It will even recognize that you are new to itunes.
I'm pretty sure you can add as many as you want
I think as much as you want....... But not all at the same time of course :P
yep it will sync no matter how few/many iPods you have
ipods can only sync with one computer at a time.
Depends who the child is. Around $40/$50. or, if they like music, an iTunes card. Many teenagers have iPods and enjoy the use of iTunes cards.
You can fund an iTunes account with PayPal. Don't forget that you can go to many stores allow you to purchase a re-chargeable credit card. You can use that to fund your iTunes account.
Cash can be used to purchase an iTunes gift card which are available from many retailers. You can then add the value of your gift card to your iTunes account to buy songs from iTunes.
Many people around the world have ipods and buy ipods because it's the best music player around.
lots
You can use your itunes library to sync it towards as many iPods as you wish however you can only sync each iPod with one library.