If you own a site, you should check out woorank (http://www.woorank.com/)
It gives you a free, instant, seo report on your site as well as a ranking on how robot friendly it is, looking for meta tags etc and missing alt tags.
I've found it really useful on Nexdana hope it helps a few people on here too :)
http://www.woorank.com/
I don't own the site, just found it and think it could help people (:
