Studio Blog Reader has now been created as an OpenNTF project - you can view the Project Page
here. While there are now a few RSS Aggregator tools about for the Notes client, this is the only one so far which has been open source, all of the others are commercial products.
The 0.1 release had some bugs which prevented it from being too useful for me (issues running the scheduled agents on Linux servers, problems for me when I tried on a 6.51 W32 server, and a few other random problems) it showed a lot of promise, and I'm looking forward to the next release.