I've recently been asked by both SPS2003 and MOSS users how they can move documents between document libraries and have related document versions included in the move. One simple way I've found is to use WEBDAV (or Network Places). Open two separate Windows explorer windows, one including the source document library location and the other including the destination document library, and rather than copy 'n paste, drag 'n drop the document to the new document library. But, remember to enable document versioning on the destination document library to match the versioning on the source (original) document library, e.g. keep the last 5 copies of the document before moving.