Just decided a quickie I could get done is completing the print.css files but then remembered that meant 40 or so other templates which reminded me we don't have a home for templates not in the actual package. So I was gonna ask what are we gonna do with them when I remembered the codex blog.
So is that a good place for extra templates? b2evo's use of evo and a tempskin to show how a blog looks is a good idea but maybe we can do it with a blog post? Make a templates blog, and put up a screenshot and a little descriptive bit about it? Link the screenshot to the .zip file and there you go.
Being a stub file kind of guy I'd do it with templates.php then categories for 'big picture' stuff like 2-col or 3-col and fixed width or stretchy width, then tags for whatever else seemed worth providing sortability on.