I'm a big fan of SiteGuru and NeuronWriter, both AppSumo tools. But both don't really integrate well into Wordpress, which is what my site is built on. I was hesitant to pull the trigger on ClickRank, but I'm so glad I did as this is a FANTASTIC tool for SEO optimization. Best thing? Whenever it finds a problem, it not only provides recommendations, but a 1-click process to automatically update it on your site. What?? It's really improved my workflow already.