batterypowpow

I got myself an 80gb ipod classic yesterday and i'm wondering what the difference between the file formats is. Am i right with this so far...

1. AIFF is non-compression lossless?
2. Apple Lossless is compressed lossless?
3. WAV is what CDs are?
4. WAV takes up more space than Apple Lossless?
5. AAC is compressed lossy?
6. AAC is of higher quality than MP3? (if both set to highest)

I've put 20 albums on it so far in Apple Lossless, taking up over 5.5gb which i don't really like the sound of too much since i've fallen in love with the video and podcast things.

If AAC is of better quality than MP3, what's the difference in file size (and sound) of a 4-minute track in Apple Lossless and AAC?

Thanks very much.