For consumers...
OpenLike is a simple way to tell other sites about the things you like and dislike on the web. Instead of having all of your preferences stored by a single company, OpenLike gives you a way to send your data where you want it.
For web sites...
OpenLike lets your users promote the things they like on your site through multiple recommendation, fan and personalization networks without you having to worry about the details of each network.
Here's an example of what the OpenLike widget looks like by default
And here's the code to add this to your site
<script type="text/javascript" src="http://openlike.org/v1/openlike.js"></script>
<script type="text/javascript">OPENLIKE.Widget()</script>
All code for this project is available at http://code.google.com/p/openlike/.