I've had a couple of folks report that the software throws an exception when used with the 500D.  One enterprising user (thanks, Poe!) tried switching some .DLLs around, and ends up getting the informational message that the count isn't a supported property.  It appears that Canon has shut down the counter for that model.  Sigh.  More news if I learn anything different.

Another bug - the serial number on the 50D (and on one users' screenshot I saw posted online) is wrong, wrong, wrong.  It's fine on my 40D, however.  If you notice that yours is wrong or right, and are so inclined, drop me a note.  david at astrojargon dot net 

You can't use EOSInfo and Canon's EOSUtility at the same time, so how do I know the count updates in realtime (except for the 5D, that is)?  You can still shoot with the shutter release cable (TC-8N03, or whatever), and I *believe* that you can even press the shutter button.

Also, I've had some great ideas for enhancements  sent in - let me know if you've thought of anything.