The Harry Potter iPod refers to the specially engraved iPod 4th/5th gens that sold with the Hogwarts crest. They also sold with the complete Harry Potter audio book collection. These iPods are considered rare among collectors due to their scarcity.
The 4th Gen Harry Potter iPod was released on (date needed) and sold for a very short time period. A 5th gen version was released soon after the 4th gen's release and discontinued the 4th gen version.
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Resources
Archived Apple webpage on the 4th Gen Harry Potter iPod: https://web.archive.org/web/20051001080503/http://www.apple.com/itunes/harrypotter/
Archived Apple webpage on the 5th Gen Harry Potter iPod: https://web.archive.org/web/20060426183038/http://www.apple.com/itunes/harrypotter/
Archived Apple Store page for 5th Gen Harry Potter iPod: https://web.archive.org/web/20060228072233/http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore?snape=y&cid=AOSHP0000097005