2009
Tornado Web Server Documentation
Tornado comes with limited support for WSGI. However, since WSGI does not support non-blocking requests, you cannot use any of the asynchronous/non-blocking features of Tornado in your application if you choose to use WSGI instead of Tornado's HTTP server. Some of the features that are not available in WSGI applications: @tornado.web.asynchronous, the httpclient module, and the auth module.
in other words: WSGI sucks
2007
GenshiTutorial - Genshi - Trac
This tutorial is intended to give an introduction on how to use Genshi in your web application, and present common patterns and best practices.
very interesting template language.