Learning Joomla! for the first time? Buy the Joomla! 1.5 Essential training CD-ROM or watch it on Lynda.com.
Welcome to Joseph LeBlanc's Joomla development forum. This forum is primairly intended to discuss the development of components I've authored, such as the podcasting suite and Daily Message tutorial. Although I happily answer general questions about Joomla, you may get quicker answers by searching the Joomla forums.
Due to spam abuse, you must register to post in the forums. However, you are allowed to browse the forums without registration. Commercially-oriented, off-topic messages are $100 per word, thank you for understanding!
Try changing the author field to an email address. It's quite possible that iTunes changed their format. iTunes likes properly formatted RSS feeds and also adds their own namespaced tags which will pass in the validator.
The changes I'm making to the Podcast Suite are in the 1.5 version and not the 1.1 version. If you have any opportunity to move to Joomla! 1.5, Podcast Suite 1.5 should produce better results.
