Not sure if you were aware of this or not but the silverstripe.com rss feed is no longer working. Probably just need to update the pointing location of the feedburner feed.
Also I only realised this a little while ago that feedburner has a "health check" feed which you can subscribe to to simply get notified if the feed breaks or is unreachable for any reason. Good little service that wasn't obvious when I signed up.
What is "GSoC r39702" and where do I get it? I have V2.2.2 and iGoogle and My Yahoo feedreaders are NOT getting the latest posts using http://www.mysite.com/blog/rss. The feed directly in the bropwser is fine, but external parsers are having issues. Anyone experience this?