I would like to develop several templates in Dreamweaver for potential customers. These templates would be very complete, with each page laid out so that all the customer would have to do is make changes to the editable regions, change out a few graphics/photos, and they would be done and ready to go live. I found something like that on httP://www.free-dreamweaver-templates.org.
Here's the thing. I own both a Mac and a PC. I do all my web design work on Dreamweaver MX on a Mac. I don't think I even have a copy of Dreamweaver on my PC. Is it possible for me to create the templates on my Mac, upload them and then do the client's final tweaks/edits through the web interface on my PC in Internet Explorer?

I dont think it would really matter - the web is a universal medium!
(However i would work using the format most of your clients would use to view the site)