Hey Rob,
Here is our quick off the top of our head list:
Great Lakes Charter Operators
http://www.osprey-dive.com/index.cfm
http://www.rockportdivecentre.com/
http://www.islanddiver.ca/
http://www.northerntechdiver.com/charters.php
http://www.scubaplus.ca/charters.htm
http://www.dansdiveshop.ca/
http://www.aquaholic.ca/html/gallery.html
We want to add more and make it a bit nicer with a bit more information. Rob if you (or anyone else) sees a missing charter operator on this list let us know.
Once we figure out the format we will make a sticky post and pretty it up.
Serge.