Each Demonstration page includes a snippet of JavaScript code in the sharing section of the sidebar.

Just copy and paste the code into your website or blog to put the live Demonstration on your site. Anyone using Mathematica or the free Wolfram CDF Player will be able to interact with the Demonstration.
Check out this blog post from Vitaliy Kaurov for more information, including a short video:
http://blog.wolfram.com/2012/04/24/add- ... easy-step/
-Kathy

