Hrm, that one loads fine... but fulltextrssfeed.com/www.sfgate.com/rss/feeds/blogs/sfgate/offtherecord/index_rss2.xml fails with "unable to retrieve full-text content" and fulltextrssfeed.com/www.kqed.org/rss/arts.xml fails with "Unable to parse this page for content."

I have a lot of experience with fetching and parsing feeds and pages, so I'm not trivializing the problem, just observing issues I'm seeing with this solution.