During the past couple of weeks we noticed that whenever we tweak our theme or change something in one of our posts, it causes some pages to become XHTML invalid. We came to think that you never know where it is going to hit you, so we sat down and created a small application which helps you keep all your pages XHTML valid. We checked it on our sitemap, and seems we have some HTML work to do :).

This application is written in WPF and is based on the .Net Framework 3.5.

It will allow you to validate you entire sitemap in one click. The validation is done through the W3C validation SOAP service, so you can trust it :).