Although not specifically focused on Dungeon Crawl Classics, I have included this podcast for an honorable mention because (1) Appendix N played a large enough part in the formation of Dungeon Crawl Classics that Joseph Goodman reproduced it in the core rulebook, and (2) Jeff Goad's activity in the DCC community, including running regular public Dungeon Crawl Classics and Mutant Crawl Classics games, ensures that, where appropriate, the podcast touches on these games.
Appendix N is a list of recommended reading first compiled by Gary Gygax in the 1st Edition Advanced Dungeons & Dragons Dungeon Master's Guide. The list includes works cited as having specifically influenced the development of Dungeons & Dragons. Actually reading these books was part of the process Joseph Goodman embarked upon when he created Dungeon Crawl Classics, and Dungeon Crawl Classics has mechanics designed to specifically emulate at, the game table, the types of action, events, creatures, and characters that give these stories their unique feel.
Not everyone, of course, is going to have a huge collection of Appendix N literature to read through, so podcasts like the Appendix N Book Club and Sanctum Secorum, which discuss these works and their relationship to gaming, are very welcome indeed! Even if you have read through the Appendix N list, it is interesting to hear others' perspectives on these works.
Definitely worth a listen.
Listen to It Here!