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Active Textbook is an interesting service that you can use to turn your PDFs into multimedia documents. The basic idea behind the service is that you can upload PDFs and add pictures, links, and videos that are displayed when students read your PDF through the Active Textbook viewer. While reading your PDF through Active Textbook students can highlight, draw, and add comments to the document. Active Textbook could provide a good way to create your own short multimedia texts for students. The most compelling feature is the option for students to highlight and take notes on the document while they're reading it through Active Textbook. Active Textbook also adds a dictionary tool to your document which could be handy for some students. Active Textbook is free to use for up to 500 pages of material.

CK-12 Foundation is a nonprofit organization that offers free, fully customizable, open-source digital textbooks for math, science and engineering classes that are aligned with the standards. Users may read, download, print, and annotate these books written by subject area experts and educators on any ePub compatible device.  Teachers may incorporate all. Most, some, or no content from CK-12 into their digital textbooks, and can build their own from scratch. To create a true multimedia experience, textbooks contain images, videos, graphics, web links, and animations. 

We have been restructuring the database and the organization of Digital History for the past three years, and we feel this makeover will significantly improve the usability of our materials. In our new interface, materials are organized by era, so users will easily be able to view many different types of resources for a particular era such as the textbook, images, primary sources, multimedia and teacher materials.