Manual - Latest Version
The Maude manual for Maude 3.2.1 is available in PDF format and in HTML.
The source code for the examples used in the manual is also available here together with the examples from the Maude book.
A primer written for Maude 2.0.1 (but mostly applicable for later versions too) is available in PDF format.
The examples are available as a tarred gzipped archive.