I just picked up a Canon 10-22 as well, i LOVE it. such a fun lens to use.
It is a fun lens! I find the distortion to be a bit cumbersome at times, but the "lens correction" filter in photoshop does a great job of warping the distortion back to reality.
Greg, do you have a website of these camera caches or caches in general for Ontario? I'm looking into buying a portable GPS for hiking, and it would be cool to find these caches on my hikes.
I use geocaching.com. ( Its a fairly standard venue for caches ) You can enter your postal code, and it will bring up a google map of the caches around you. then you can just click the "send to GPS" button (if you have a Garmin) and you'll be on your way!
I don't think there is a specific index for camera caches, but it is usually listed in the description, so you could probably just do a search.
If you want to look me up, my geocaching.com username is "killerwhaletank"
I have found 98 caches so far