I googled around and found Zemanta, a plugin that integrates you with Zemanta’s web service to make you easily add contextual images, articles, links and tags to your post.

Once the plugin activated, upon writing the post, Zemanta will crawl for suitable pictures for our post. Maybe this picture will help you understand how this plugin works:

(Click to enlarge the picture)

You can download Zemanta here.

For the moment, Zemanta will be supporting blog application from Wordpress (wordpress plugin), blogger, typepad and livejurnal. I’ve tried the wordpress plugin. Have you?