This tutorial is based on Kevin Markham's dplyr tutorial (https://github.com/justmarkham/dplyr-tutorial). He has created a 40-minute video introducing Hadley Wickham's dplyr package.
I have modified his R markdown document and added a few more functions at the end. This can be used along with his video for hands-on coding. I will update this markdown document from time to time, adding even more sample code.
More information about the original tutorial is available on his excellent blog.