Podcast Generator is a free web based podcast publishing script written in PHP: upload media files (audio-video) via a web form along with episode information and automatically create podcast w3c-compliant feed including iTunes specific tags. It also features a comprehensive web administration

Some technical details
Database Environment: XML-based (No MySQL needed!)
License: GNU General Public License (GPL)
Operating System: OS Independent (Written in an interpreted language)
Programming Language: PHP
User Interface: web-based

Podcast Generator Features:
Easy to install.
Easy 5-steps web setup wizard!
Supports ANY media filetype:
Create mixed audio and video podcasts: Podcast Generator supports iTunes extensions (mp3, m4a, mp4, m4v, mov and pdf) and many other filetypes such as: ogg, avi, flv, jpg, mpg, wma, wmv, aif, 3gp and amr (mobile video and audio)... just upload your media contents and the program will autodetect the filetype!
XML feed generated is fully compatible with Juice and iTunes, meets the w3c standards and supports iTunes specific tags!
Podcast Generator automatic feed generation process follows the w3c standards and fully complies with iTunes technical specifications.
Add specific tags to your podcast, such as iTunes categories and keywords, explicit content and podcast image to show in iTunes music store.
Password protected web administration interface: upload, edit, delete episodes and fully cusotmize the script!
Change every aspect of the script throught the complete web administration.
Dynamic "All podcasts" and "Archive" web pages showing title description of the file.
Podcast Generator provides complete tools to publish your podcast; a page showing last n podcast and an archive of all podcasts are automatically created. Every podcast has a dedicated detailed webpage (permalink) showing description and allowing to download the file.
Multilanguage support.
Categories and feeds per category.
Organize your podcasts into user-created categories! In addition every category features a podcast feed.
FTP upload of episodes.
You can use this optional feature to upload podcast audio and video files via FTP, avoiding web-upload size limits imposed by your hosting provider!
Themes support.
Easily customize Podcast Generator aspect!
Web mp3 streaming!
Play mp3 files directly on the web pages!

Demo:
http://www.podcastgenerator.net/demo/