I am looking to get a site based off wordpress in which users can navigate a "tree" system of tags or categories to find the right audio file they are looking for. (Eg. Animals > Pets > Cat > Kittens) Once here the user would shown a list of the available files that fit the categories and then can sample the audio and be presented with and option for download in a couple different formats. Amazon S3 integration a huge plus as would be some more details per each file. Length of audio, location, etc. Any suggestions?