In the process of writing Interspring I had to develop a MySQL backed rss (and atom) feed processor and storage infrastructure. After much work and frustration I'm happy to say that the feed fetch/parse/store backend of Interspring has be running uninterupted for over 6 months. I think that after I normalize the MySQL tables and pretty up the code a bit I will release it as an open source product. If anyone is interesting in testing and or using it...please drop me a line here.