Thousands of podcasts are already listed with BadApple and the website states that the list will be updated automatically. All Podcasts currently listed in BadApple are free to download, but surprisingly, BadApple only works on Microsoft Windows computers
3store is an RDF "triple store", written in C and backed by MySQL and Berkeley DB. It is an optimisation and port of an older triple store (WebKBC). It provides access to the RDF data via RDQL or SPARQL over HTTP, on the command line or via a C API.
YARS is a data store for RDF in Java and allows for querying RDF based on a declarative query language, which offers a somewhat higher abstraction layer than the APIs of RDF toolkits such as Jena or Redland.
F. Abel, J. Coi, N. Henze, A. Koesling, D. Krause, and D. Olmedilla. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 1--14. Berlin, Heidelberg, Springer Verlag, (November 2007)
F. Abel, J. Coi, N. Henze, A. Koesling, D. Krause, and D. Olmedilla. Proceedings of the 6th International Semantic Web Conference and
2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 1--14. Berlin, Heidelberg, Springer Verlag, (November 2007)