I had my iPhone on our family computer, but for Christmas we got a brand new family computer and I got a laptop. My iTunes account is still on the old computer and the credit card it was charging to is now shutdown and I really want to be able to buy more songs off the computer. Please help!

I recently switched computer and had to authorize another computer for my itunes/iphone account. I noticed that my Iphone apps that I downloaded on the other computer were not present here, how do I transfer it into my now computer? Do I have to rebuy the apps?

I have AT&T and i was thinking of getting the iPhone because this week my contract is up for my old phone. The iPhone is normally like 400-500 dollars, but now that im upgrading my phone its a different price. What would be the price now that my phone is going to be upgraded?

I just got rid of the computer i usually sync my iPhone on. And, as everyone knows, the new 2.0 update is coming in very soon.
I have so many things on my iphone that i can’t get anywhere else.
Is there a way that I can sync my iphone on another computer without erasing everything already on it?