Congratulations: as a Web publisher you’ve been approved for complimentary access to Britannica Online. This message contains the information you’ll need to sign up for your free one-year subscription to our Web site, which includes the entire Encyclopædia Britannica as well as many other sources of information and rich multimedia.

As you can see, Britannica Encyclopedia offers free access to bloggers, web publishers, etc.
You can also embed content on your website. I  think this will be some great news for my colleagues at www.descopera.ro.

Here’s some information about our future doggie – Chewbacka ;)

Full story on TechCrunch.

Later edit: the embedding does not work as expected. Apparently you cannot embed a specific article, but only topics. For example, I wanted to display an article about Golden Retrievers above, but i just got a general Dogs widget. Bummer!