A writer's work is never done. After Office 2008 went out the door, they started collecting data about the help. Based on this feedback, they've been continually updating the help, releasing new and updated help topics every month.
As part of their efforts to provide help that's helpful, we've now made some short video help available. You can view it within the Office:Mac 2008 Help Viewer (make sure you're in online mode) -- type "videos" in the search box, and you'll see 'em all.
Now, they're also available as a video podcast in iTunes. Search for "Office 2008 for Mac" in iTunes, select the podcast, and subscribe. Or you can just follow this iTunes link.
There's currently 23 videos there, with more coming in the future. We produce all of our videos in-house, even down to the voiceovers -- those are real MacBU people you hear there.