I have heard that AAC compresses Mp3s into smaller, but just as good sound quality Mp4s, is this true? If this is true, what would the amount of songs in ratio be to what can fit on the 5 GB iPod now and then what can fit with AAC. If Apple incorporates this, when might we see this awesome stuff. The reason I ask is that I am so close to fillin up my iPod and I got no money to buy a new one, and I dearly love all of my music. Thanks in advance!!!