We have started on such implementation, but it is not in the product yet. The approach we use is, storing the rating in a meta data field. The public part of this, is jQuery implementation, allowing you to rate. Here are the basic steps you should follow:
1. Create a new meta field for your blog items. This is described in our User Manual, Customizing Modules section.
2. Use GetMetaData and SetMetaData methods to get and store the meta data.
I hope this helps.
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.