Yoast Breadcrumbs is another great way to help search engines determine what a post is about, as well as giving your users a good guide as to where they are within the structure of your blog. Breadcrumbs are those navigation paths you sometimes see where it shows something like Home > Jeans > Levis
Meta Robots plugin is for those of you who want really detailed control over every piece of your blog in terms of what gets indexed or not, and what gets followed or not. It may be overkill for some, but it can be very useful as well.
RSS Footer is a great way to benefit from all those darn scraper sites that use your feeds. This makes sure you get a link back from them.