The online IT Training company CBT Nuggets started publishing “MicroNugget” video classes to YouTube a couple of years ago. These MicroNuggets are videos that are approx. 5 minutes long and target extremely specific concepts in IT. The idea behind these types of videos was to show how good the training CBT Nuggets creates is so that you’ll subscribe to their full package of videos. These are complete 5 minute classes and are not simply half assed “see more at” advertising.
If you’re looking to dig deeper into IT concepts you don’t normally see you should definitely check them out.
View them here: https://www.youtube.com/user/cbtnuggets/
Disclosure: I created a few MicroNuggets back when they started doing this, but no longer am involved with them