For reasons I don't understand, iTunes actually comes up with two versions of my feed. If you search the podcast directory for Math4Knitters, you should subscribe to the feed marked "visual arts" as the category. That is the one that is working properly, except for some reason, the publication date is coming up wrong. The safest way to get the show is to go to Advanced>subscribe to podcast in iTunes and paste in http://www.laraneel.com/podcast/Math4Knitters.xml
I hope that works. I don't know why the show from May, with my lovely sister, isn't really showing up. It might be because of my hard drive wipe out, but I don't know.