A new AJAX enabled version for DNN 5.x is available from here, jQuery and DotNetNuke Modules
What is it?
It's a free module for DotNetNuke 3.x/4.x/5.x that lets your visitors rate your pages. Its the module in the top right corner of this page.
You can define the permission required to vote and set a time limit before allowing the same user to vote again.
The module has been tested with versions 3.x/4.x/5.x of DNN, the data provider used by the module is MS SQL Server.
Its written in C# and you can download the module, source code and user guide below.
Downloads
User Guide
Rating Module PA
Rating Module Source Code (C#)