Ontolica-Surfray was a sponsor at our SharePoint Saturday last year and gave away a free one-year license to their Fusion product to every attendee. Well, Steen just messaged me and told me about a new feature they have introduced for Fusion. I know I want to try it!
Fusion Drive
Fusion Drive allows a Push/Pull/Sync files with users Desktops or local/network folders and SharePoint.
More information can be found at http://www.manula.com/manuals/surfray/fusion/ftdt1/en/topic/fusion-drive