If you haven't seen it, w3.org offers an HTML Validation Service for free that is pretty cool. Give it a URL, and it calls the URL and checks the document for errors and HTML validity. Of course this page bombed the big one, but I'm still in a major rebuild process here, so I'm not sweating too much as long as it renders in IE and Mozilla. They also offer a CSS Validator that I haven't had a chance to test yet. That one also appears to offer a download.
While it's on my mind, here's a quick tip (and sample code) on forwarding from a servlet to a JSP.