Where to find XSL examples
You'll find many pointers related to XSL on the ODP http://dmoz.org/Computers/Data_Formats/Markup_Languages/XML/Style_Sheets/XSL/, and you are welcome to submit more if you find some.
Also from Stuart Zakon, You can see an example of using XSL to convert XMI (UML persisted in XML) to HTML at the following page: http://www.objectsbydesign.com/projects/xmi_to_html.html
Chris Bayes also offers:
XSLT very complex
Library of XSLT stylesheets
At sourceforge The XSLT Standard Library, xsltsl, provides the XSLT developer with a set of XSLT templates for commonly used functions. These are implemented purely in XSLT, that is they do not use any extensions.
Goals of the xsltsl project include:
Provision of a high-quality library of XSLT templates, suitable for inclusion by vendors in XSLT processor software products.
Demonstration of best practice in XSLT stylesheet development and documentation.
Provide examples of various techniques used to develop XSLT stylesheets (ie. a working FAQ).