I know you can hook multiple devices to one computer and sync via iTunes. Here is my issue. Desktop with my music & video - iPod goes to that HP Laptop with applications - iPhone goes to that MacBook with applications - iPad goes to that I know, crazy. All three use the same iTunes sign in. I've preordered my iPhone 4 and plan to replace my original 3G iPhone and iPod with that. However, since all of my music is on my desktop, what is the best way to get it to my HP laptop? I'd like to sync all my music to my new iPhone and all my original iPhone apps to my new iPhone too. Would it be easier to move the original iPhone apps to the desktop or redownload those to the desktop since my music is already there? Or is there a way to plug my iPod into my HP laptop (with no music on it) and transfer all my music from my iPod to the HP laptop? How much more trouble would it be to have my new iPhone (with music & apps) on my MacBook where I have my iPad currently, with it's apps? I don't mind using two computers, but I'd hate to keep using three since I want to combine my iPod music onto my new iPhone.