Hi David
Sorry I can't try it in Moodle right now, but FWIW your feeds seem to be working in other RSS readers. iGoogle choked on the lovely URL, but Firefox handled it ok.
Now aka
http://tinyurl.com/4sbagw
it works fine for me as a feed in Firefox and iGoogle.
Aka http://feeds.feedburner.com/WitInstitutionalRepositoryChooseYourAcademicDivisionMatchesschoolOfBusinessRMD
also read fine by Firefox and iGoogle. I can't see any probs with that feed either - fine in iGoogle and Feedburner, and in Firefox and Thunderbird. Now aka
http://feeds.feedburner.com/WitInstitutionalRepositoryNoConditions
You might want to check out the Moodle Bug Tracker in case the issue is with them
http://tracker.moodle.org/
Some RSS feed problems reported there were resolved as local proxy/firewall issues.
HTH
Richard