53170 PODCAST Index site

I need a site to index PODCASTS and list them along with their XML info etc. I want people to be able to come to the site and choose from a range of different podcasts and be able to subscribe to them from there. See: [login to view URL] Thats a basic site, but I am looking to add 'Review' system and 'Rating' System also. See: [login to view URL] [login to view URL] This will be NICHE SPECIFIC as I have a specific target audience in mind. I NEED it to be able to crawl to find new PODCASTS to build the directory. I dont want to wait 6 months for users to build it for me, I want to be able to seek out and pull new podcasts based on keywords or something. I dont know, suggesta solution. CREATIVE SOLUTIONS NEEDED!!