BBN Rolls Podcast Search Engine

There's a new entry in the world of podcast search - Podzinger. What I like best about it is that they are giving podcasters tools that they can add to their sites or blogs that help consumers search just their podcasts. From the looks of it, they are just crawling show notes. They offer persistent searching through RSS. I'm not sure what the value add here is. There are other tools that achieve the same end.