(Note: Disclaimer due to an active relationship around this general space.)
Scott Johnson (VP of Engineering and Co-founder of Feedster) announces a new bit of Feedster functionality that allows users to search only MSN Spaces blogs by heading to spaces.feedster.com.
(The functionality actually allows you to restrict your search to any Host, rather like Google’s advanced search ‘site’ feature. Scott’s posted, linked above, has the details.)