A table of all iPod related devices and their generations.
Generation Ipod Classic Ipod Mini Ipod Nano Ipod Shuffle Ipod Touch Ipad
1st
2nd
3rd
4th
5th
6th
7th

A table of changes with each generation of iPod devices.
Generation Ipod Classic Ipod Mini Ipod Nano Ipod Shuffle Ipod Touch Ipad
1st
2nd Aluminum body. Smaller design with clip. Added microphone and speakers. Added front and rear cameras.
3rd Added video, became wide. Removed buttons, used voice commands. Started to multi-task.
4th Became narrow, kept large screen. Returned buttons with clip. Added front and rear cameras.
5th Added video playback. Added a video camera.
6th Became small, touch screen controls, removed camera.