Well, there are two other things you could try:
1. Create a custom RSS provider. You could use the following example - http://www.sitefinity.com/support/forums/support-forum-thread/b1043S-bgcagk.aspx
2. Use our API to pull out the contents of the blogs module, and to represent them as an RSS structure. Please take a look at our Developers Manual -> Find Blog Items with GetContent() method.
I hope this helps.
the Telerik team
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