The Wrox publication does have a chapter dedicated to
struts in their latest books

Professional JSP 2nd Edition.

Also the code samples are available for ftp from the
Wrox site.

The chapter contains a very good praticle application
that is modeled around the frameworks example
application.

One gripe I have about this example is that there is
no DB calls and all the informations are loaded from
an XML file...

Also I there is a new book being released about the
Strut Framework available in .doc format. It is still
in the review stage, but it has some good technical
stuff on it and avialable from the "theserverside.com"
website...