Here will soon appear an overview of the user perspective of XSP.
The actual user documentation is available from the side-panel.
XSP learning map
As I find that there is enough information about XSP available (only
not together), I give you a list of pointers in the sequence you should read
Get Cocoon up and running. Surf
[webhost]/cocoon/slides/slides?section=4 and following. This
gives you a first insight in the XSP ground idea.
Read the XSP Logicsheets page. This tells you how to use and make
your own XSP logicsheets and XSP pages.
If you're still hungry for more, read the XSP Internals page. This
describes how XSP's are handled internally by Cocoon.