I have recently downloaded the latest version of Kinovea, a freeware video analysis tool. The new version allows all sorts of analyses to be performed using this very simple freeware software. The beauty of the software is the fact that is free and is of very good quality. I think it is a great coaching tool and with some minimal equipment can be extremely useful to share analysis of sports techniques between practitioners and coaches.
Kinovea can be dowloaded here.