Tending to Morise and Tenons
This entry – provided for free from the book Woodworking for Dummies – shows some interesting aspects of creation of mortise and tenon joints.
From the absolute basics through more advanced discussions about angled parts of the joints, this is a basic primer on the joint. While you will want to do some more searching for more detailed info, this isn’t a bad place to take in a little bit of info on one of the most useful woodworking joints.