If I buy an iTunes gift card, and use it to purchase a song from iTunes, will I keep the song forever, or is it a 1 download type thing? And is there a time limit on how long the song will work for? Also, can the songs I download be listened to in another program (such as winamp), or put it on a CD or something to listen to in my CD player, or does it work only in iTunes and on an iPod? And as a final question, how does buying iTouch apps work? Will I have to repurchase them if I, for whatever reason, have to erase everything on my iPod touch?