This video podcast from the NotesIn9 series gives a short overview on the Lotus Product Wiki's.  It discusses navigating the Wiki's and why you might want to ad content to the wikis and then in the goes on to demonstrate how to add an article and get started making your articles look good by using the Wiki Markup Language.
 

Video Demonstration

About the Author

David Leedy is a Domino Developer for a Transportation company.  He maintains a blog at http://lotusnotebook.com|Lotusnotebook.com">Lotusnotebook.com">http://lotusnotebook.com|Lotusnotebook.com and produces Notes In 9 ScreenCast, the original Video Podcast dedicated to all things Lotus but especially XPages.