Well, I have gone off and started up a book store of sorts that lists Lulu authors books for sale (with redirects back to Lulu spotlights for previews and sales.)
Anyone interested in listing a few of their books is welcomed. Although we have just started, we've listed with all the big search engines, etc. and are looking into the various ways of marketing the website to the general public to drive interest (and hits) to the site.
If nothing else, it provides just that much more exposure for your work.
Let me know if you are interested.