The shutter count information is available *only* on Canon DIGIC III/IV DSLRs *except* the 1D* series. This means that EOSInfo will display the shutter counter for the 40D, the 50D, the 450D, and the 1000D. It will also show the shutter counter for the 5DMkII, but the camera must be power-cycled before the value is updated. The shutter counter will not be displayed (or will be displayed as "0") on the 1D*, 5D, 10D, 20D, 30D, 300D, 350D, and 400D. It's not that I have anything against the owners of those cameras, but simply that the Canon SDK does not support retrieving the shutter count for them.
Apparently, Canon has removed the facility for checking the shutter count on the 500D.
