It's called ebookbooster.com. Don't be turned off when you see dollar signs on the page; they offer to submit information about your ebook promo to 45+ sites for $40, but this is only for the lazy amongst us. You can do it yourself manually (and for free) by using the list of websites they provide in the left sidebar. All the sites are listed (45+) and as an added bonus, they link you directly to the book submission page, so you don't have to waste any time navigating through each site.
Very helpful indeed!