Apple has posted a KnowledgeBase Document with information about iPod Software 2.0.2 installed on some iPods:

“Some iPod (with Dock Connector) models include iPod software 2.0.2, which is an update used in manufacturing and has no functional changes.

Certain iPod (with Dock Connector) models include iPod software 2.0.2. The 2.0.2 version of the iPod software is an update used in manufacturing and contains no functional changes.

It is not required, and is not available as a download.”