If you publish a Podcast or you run a website that relates to podcasting and want to be listed in PodcastDirectory.org please find the appropriate category and add your site.
You should only submit your website if it contains podcasts. Every day people submit their websites to this directory without following this rule - these are naughty people who are guilty of wishful thinking and will not succeed. It takes 1 nanosecond to delete sites that don't relate to podcasting and nobody but the administrator will ever know you tried. Really - just don't do it.