Shades of Rose Marketing is now taking host requests. Just stop by their new site and fill out the form. They'll be up and running in a matter of days and need interested sites. If you're looking for more traffic to your site and want to help promo fellow authors, hosting a tour is a great way to accomplish those goals.
While you're there, check out their promo packages. They have some nice options at affordable rates. They're booking tours now!