Professional Illustrator Brian Zaikowski teaches this amazing 24 hour Adobe Illustrator tutorial. Yes, a full day's worth of videos, but you don't have to tackle them in any particular order. These 111 videos are like books on a shelf just waiting for the moment you need to learn everything about a particular tool or preference in Illustrator. Or for those true of spirit that want to master Adobe Illustrator in a couple days, you can begin in alphabetical order and learn nearly everything about this program.
You'll get 111 videos in total, with over 50 source files. Since each video is focused on a Tool or Preference name, they are around 10-20 minutes in length and organized accordingly.