it depends on what you use them for and if they`re universal charges.
ipods come in all different colours
well there are many i think there are about 4 or 5 different ipods and they are so fun
No
Of course you can.
No
yup :)
No
Ipod docks can only be used for one ipod at a time when it is playing, but they can be used by many different ipods belonging to severaly different people.
the different types of charges are positive and negative charges
Here Is a App review site
No they are different sizes for 1 and ipods look different to mp3's. These are only a few so anyone can do a better answer.
No. In the iPod Touch's case, it is too thin. For other iPods, they are different shapes than the iPhone anyway.