The web holds a wide selection of information about the Morris as a dance - for further leads see:
The Morris Dance Discussion list has an associated wiki which give a lot of information about contacts and resources.
The umbrella site www.morrisdancing.org provides a link to the three UK Morris organisations:
For the sword traditions, check the Nut on the net.
There's an archive of beasts and other peripherals....
Mummers plays (or folk plays) are recorded by the Traditional Drama Research Group.
A large number of sides have home pages. These are indexed in