Validation == Clue

Sam points to a great article
by Mark on validation
as an indicator of cluefulness. Quite apart from the issue of mailing list ettiquette
(i.e. please try to at least look like you tried to find the answer before
asking us), I think that as I move more into the world of XML, HTML, and XHTML, I'll
find myself relying on this type of validation more and more. Good stuff.