Feel free to enter here the bugs you just found.
Validation
pages are not XHTML strict as the search form includes an input element directly inside the form one.
Seems to be a PHP bug : it insert not well formed html for session handling. Namely, it adds a PHPSESSID hidden input at the wrong place in the form document.
Diff algorithm
Very simple, needs a lot of improvement as it is far from only showing minimal differences.
