Good question! I actually deleted some of the earlier videos I made over 2.5 years ago because the screen shots were very small and blurry. The videos that I deleted are:
Excel Magic Tricks 23-98
and
YouTubersLoveExcel 1-10
All the content in those videos are replicated in other videos. Before I deleted them I re-did all the videos that had content that was not duplicated somewhere else.
If you are watching the videos from number 1 to 690 in order to learn Excel, the best option is to not watch the Excel Magic Trick Series because it is just random tricks presented in no particular order. If you goal is to learn Excel it is best to watch the playlist of videos that I use in my classes at Highline Community College. The two playlists are:
Excel Basics Series
http://www.youtube.com/view_play_list?p=3FBEE51974F03CCF
then
Highline Excel Class Beg - Adv (Complete Class - 59 videos)
http://www.youtube.com/view_play_list?p=D8EEA7196D943ED5
Workbooks at same site you already had:
http://flightline.highline.edu/mgirvin/ExcelIsFun.htm
Those two playlists lay a solid foundation for all the other videos.