Autodesk decribes Project Butterfly as "Google Docs for AutoCAD"... a completely online edit and collaboration tool in which you can share DWG and DXF files with other users. No need to download or install any software. Project Butterfly shares files directly on the web and other users need only an account with Project Butterfly, which is currently in an open beta mode. Directions Magazine's Editor in chief Joe Francica provides both the details and a quick demo.