From Prosit Software:
iDictionary is a Mac OS X application that allows you to put a dictionary and/or thesaurus onto your iPod. iDictionary leverages the Oxford dictionary available with OS X 10. 4 along with some very smart filtering and optimization techniques to create a dictionary or thesarus that will fit on an iPod. The dictionary or thesaurus is displayed on your iPod using the iPod's built in "Notes"feature. The "Notes"feature, which is needed to view a dictionary or thesaurus on your iPod, is availible on 3rd generation or newer iPods (sold since April, 2003).