Too many.... 11 so far:
1. 20GB 3G - left on plane
2 .20GB 3G - the replacement (sold)
3. 4GB 1G Silver Mini (sold)
4. 6GB 2G Silver Mini (sold)
5. 40GB 4G Photo (sold)
6. 60GB 4G Photo (sold)
7. 512MB Shuffle (sold)
8. 4GB Nano White (sold to get iPod number 10!)
9. 512MB Shuffle (again... and sold again!)
10. 4GB Nano Black - personalised so its actually a keeper!
11. 60GB 5G Video - still got!