A couple of days ago, I found this email of Jeremy Shoemaker (Shoemoney) about FreeSEOReport.com.
I think this service is well worth having a look at. Once you submit your site and keywords, it creates an extensive report about your own and your competitors site analysis (SEO on and off page factors). The report can be a good start or an aid to your existing SEO campaign. It has already helped pointing out some issues on my site.
Free SEO Reports from Free Seo Report Dot Com