yes
all iPod cables work interchangeably, except for the iPod shuffle.
If it is an iPod Touch, yes, you can work on an iPod or use the iPod while it is charging.
no
No, .avi does not work directly on ipod.
Yes, they do work with the iPod Touch 3rd Generation. The earphones should have came with the purchase of the iPod itself. But yes they do work.
no
All iPod chargers work with all iPods.
Yes, iPod headphones work in Blackberries, any headphones will work with a Blackberry.
Yes, the app textplus was made for the iPod touch. If it is on the Appstore for Apple, IT WILL WORK ON AN IPOD TOUCH.
The entire will not fit on any iPod currently available. What works for many people is to think of the apps store as an online, specialist shopping mall for you to see and buy from. Connect your iPod to your computer, change webpages to the apps store and look for apps that will work on your machine. It is your descision if or what you choose to buy and download any apps through your computer to your iPod.
It would work on the new iPod Touch with the camera.