A quick post for now. Here is my contribution of the ISS transitting the Sun this afternoon. Dennis' shot is excellent and mine is not as clear as his so I have added some artistic licence to the colour

.
The image is a compilation of 25 frames taken with a Canon EOS 550D shot at 30fps, 1080x1920 at prime focus of a 12" Sky-Watcher Dobsonian telescope. Unguided/untracked because my power was not working soon after I set it up.
I have added a link to a video showing the real time crossing:
http://www.youtube.com/watch?v=qjJ3YY4rz6c
Cheers,
Tom