Best SEO Plug-Ins for WordPress

Right now I think the Best SEO Plug-ins for Wordpress are

• Wordpress SEO by Yoast - Yoast knows Google and how to rank web pages.  Wordpress is a free plugin and everyone with a wordpress website should have this. To find out more check out Yoast's Website.
• Easy WordPress SEO by Chris Landrum - Currently the website is up, but isn't active.  You can find out more about the program on the Warrior's Forums.  Easy Wordpress SEO is a premium plug-in and as such isn't free.  The current price is $35.