The Zoho Notebook demo video posted on YouTube is an excellent example of using different types of media to convey information.
I noticed that Rajuv has 5 videos posted concerning products and announcements from Zoho. I assume this is Raju Vegesna of Zoho.com. This is an excellent use of YouTube.
Being a content developer myself, part of creating a good solid product is to ensure that there is available content – written, web-based, and demo’s that will help users learn how to use the product. You can create the best product in the world, but if there isn’t content out there to help users figure out how to use it, adoption of the product can be severely impeded.