Google launched a new community on YouTube for Google Docs users to share tips and ideas for using Google Docs in education and other arenas. The community features how-to videos created by Google and by Google Docs users just like you. The video playlists cover everything from the very basics through advanced features of spreadsheets in Google Docs.
http://www.freetech4teachers.com/2010/11/new-google-docs-community-offers-how-to.html