The Glidetrack shooter. I saw this at WPPI and was in love with it. I got one from the company and have loved working with it. Its a small motion track that will allow you to make moves with the camera without the use of a dolly.
I think this is the future of motion rigs for the 5D. You do not need a large dolly to achieve good fluid and effective motion shots. Its worth checking out. Go to his web site and see for your self. It ships from Scotland. I did get the HD version but the SD or standard weight version would be fine for the 7D or 5D. Glidetrack also has a long track that I would love to get my hands on and see how it works. When I do I will let you know what I think.