I would love to see someway in SiteSpinner to view thumbnail images of template designs so I would have some idea on what I am going to be working with instead of having to load each template just to see it.

And it would be nice to be able to preview projects from the File > Open menu too

I agree here. I asked the same thing and Derry stated that it is in the works. So I am unsure when we will see this implimented.

I hope soon. Because it is a pain in the butt to open the files just to see them.

Can't comment on 'when'. But I can say we're 'listening...'