WordPress SEO, Best set your parameters and make life easy for Google!
Great quality without spending a cent
No compatibility issues
Great SEO friendly help
You have to spend some time configuring it, but it is inevitable in a plugin of this type
Needless to say too many words. Yoast guarantees and Wordpress SEO is definitely a must, one of the first plugins to install in our WP if you want to be really SEO friendly and reach the highest possible number of people.
Type: Free/ Premium
Current Version (look at review date): 2.1.1
Premium Price: starting from $69 for single site license
You can find it on: WordPress.org or Yoast.com