Not sure if I've done a post here yet my collection is a big one:
Classics:
1G - 5GB
2G - 20GB
3G
4G Photo
5.5G U2 Edition
6G (Current Revision) - Silver
Nano
1G White
2G Red
3G Red
4G Red
5G Red
6G Red and Silver
7G Red (On Order)
Shuffle
1G (with all accessories)
2G (silver, red, orange, blue, and a few others)
3G (silver, black, green, limited edition unopened, a few others)
4G (silver and green unopened)
Touch:
4G 32GB
I've got more but those are just off of my memory - I'm working on a rather in-depth book about the iPod that is launching at Macworld iWorld 2013 - stay tuned for more info about that in the coming months
Tim