An extract from one of the MOSS Team blog entries which sounds interesting;
"Colligo recently released 2.1 of their Contributor for SharePoint, which provides similar synchronization and offline access capabilities for SharePoint content as their free Reader for SharePoint, but it offers update and sync back functionality that the Reader doesn't have. Contributor, just like Reader, can synchronize not only with WSS 3.0 and MOSS 2007 but also WSS 2.0 and SPS 2003! Contributor also includes an Outlook Add-in that provides true 2-way synchronization between SharePoint document libraries and Outlook 2003 or 2007 folders, which is a very often asked for improvement over Outlook 2007's native 1-way synchronization with SharePoint document libraries. The Outlook Add-in also provides drag-and-drop archival functionality for relevant e-mails that are copied or moved to an Outlook folder that is then synchronized with a SharePoint document library. The Outlook Add-in automatically captures standard e-mail fields and maps them to metadata in the document library! Here's a screencast of how the Outlook Add-in can be used to significantly enhanced the Sales Lead Pipeline application template for WSS 3.0. For more information about Contributor for SharePoint, go to http://www.colligo.com/products/sharepoint/contributor_home.asp."