My brother has his iTunes library on a Dell laptop, and I have my library on my iBook. Both iTunes libraries are under the same credit card account. Occasionally, we want to get the same song, however I wouldn't want us both to pay the $.99 where virtually the same account is purchasing the song twice... so how can I and/or he download the songs from each other once it's purchased on a single computer? AFAIK, there's something called file sharing but I'm not sure how to do that, can someone please help me?