I just used this one, which is free (although paypal donations can be given)
http://www.shutteractuations.com
you run it from your computer, but nothing is installed. Works a treat. I'm almost 25% through my camera (5d2) at 35,000 photos to date.
Thanks for finding this! Worked for my T1i and 5D3. I actually had downloaded the canon sdk a while back to write my own app to get the shutter count for myself, but have been too busy lately. Now I don't need to bother 


