Hi RegentsScholar06. All of the content is still on the site, just in different places (in the Worksheets sections as well as the Community section, which wasn't available when the first book was published), and all of the videos are still available on the site, just not in Flash format, but more modern streaming formats (and also through YouTube). Unfortunately I don't see as I'll have time to perform such a significant upgrade on the site in the near future to convert the manually-developed Flash content into HTML5, an extremely significant undertaking.
All the Best,
Dan