I've uploaded my Comparing Web Frameworks presentation I delivered today. This presentation is still somewhat outdated - all the stats I have in it are from February of this year (2006). I've also updated the Equinox framework-comparison page to have links to some more readable papers.
Deciding which Java web framework to use when developing your applications can be a difficult choice. I've often wondered which one is "best" myself. Since 2004, I've been playing and developing with the top five web frameworks for Java: JSF, Spring, Struts, Tapestry and WebWork. For my most recent opinion on which one is my preferred choice, see What Web Application framework should you use?. You might also checkout the following whitepapers I've written at virtuas.com: