I like your site. Here is a vertical Supersite I just published a couple of days ago:

http://everydayesp.net/

It occurred to me that a vertical supersite would be perfect for a streaming version of our home study course - people could just keep scrolling down from page to page through all of the lessons. But then I ran a test and it looks like it won't work. The uses php pages that can be protected. With a regular site, the first page is index.htm (required by Xara) and can be used as a longin page. Then all the rest are php pages. But with the vertical supersite, it all acts like an htm site and none of the pages are protected.

Here is my test site:

http://silvashop.com/memsm/

I'll try a side-by-side site and see if it works any better.

Ed