BlueHarvest

“BlueHarvest will keep your non Mac formatted storage devices free of OS X metadata including ._ files, .DS_Store files, Thumbs.ini (from Windows), .AppleDouble folders, .Trashes and many many more. BlueHarvest automatically cleans these devices as you work without you needing to do a thing.”

Homepage: http://www.zeroonetwenty.com/blueharvest/