Autodesk continues to move forward with their Saas (software as a service) offerings. While Project Twitch allowed users to test drive a variety of software without saving or uploading anything Project Butterfly give you space in the cloud to upload your files and drive through them, collaborate, save all within a web base AutoCAD environment. I have just started playing around with it, although it has been out for awhile and although there is a bit of lag but it still delivers. I believe getting files, models, etc. in the cloud is the beginning. The start of real collaboration, the start of value added services, the start of a more efficient work place and the market leader is starting to figure it out.