Hi UD (nice to see you back)
You can put the software on as many pc's as you like. There is a limitation on tracks that you buy from i-tunes though.
If I remember correctly if you purchase a track (or an album) from i-tunes store then you can authorise the track to be played on up to five different computers.....so if your daughter buys say a Madonna track and you quite like it you can play it quite legit on your pc's as long as there are no more than five pc's authorised at any one time. You can 'de-authorise' tracks from a particular pc too if you need to play it on another, different pc and you were up to your limit of five! ..... hope that makes sense
I don't think there are any limits imposed on tracks you 'upload' yourself from your own music collection.
I don't own an i-pod myself (Nigel does) and when he got his I was so impressed with i-tunes that I downloaded it. I buy loads of tracks (it is really cool I think that you don't need to buy the whole album) and often burn them onto cd to play in the car.
He wants the new i-pod video so I am encouraging him (as I will get his i-pod photo

) How cheap am I?

Best wishes
Tony