We recently updated our screencast tutorial web part (see at the left). This is a standard SharePoint list which has been saved as a convenient .stp file which you can add to your list template gallery on your SharePoint site and then add to any page with a web part zone on your SharePoint site.
The download is located here, http://blog.sharepointhosting.com/Downloads/tutorials5.stp.
Once installed, you can search your SharePoint site for keywords included in the tutorial description. For example, if you needed to know how to change your password you could just tell your users to search for that term. By clicking on the link they can easily watch the tutorial. This is very convenient.
There are also two different views – a standard list view and broken down by category as seen to the right.