![Image representing Zemanta as depicted in CrunchBase Image representing Zemanta as depicted in CrunchBase](http://www.crunchbase.com/assets/images/resized/0001/6433/16433v1-max-250x250.png)
Zemanta is a plugin that provides semantic relevant content to use in your blog posts. Its available as IE or Firefox extension, and as server-side plug-in for WordPress and few other blogging platforms.
It is still a little buggy, for instance after activation in WordPress I could no longer edit properties of images in my posts.
Its an interesting idea, check it out, but wait for an more stable release.