I'm the CEO of Millionairium which is the sponsor for free-seo dot us (cannot post the URL as I just registered here). We are a professional SEO company with over 12 years of experience in the field. We offer free SEO, which includes full optimization of any given site. But you guys are right. It's not completely free. In return, we place our link on the bottom of the site and give our company credit for the work. It's a win-win situation for everyone. You get your sites optimized properly and we get to advertise for our brand. Also, there is no link-building with this service. But we do offer that at an affordable rate.