For the sake of any webstandard geeks that might stumble upon my weblog (yes, you), and to make life a bit easier for myself, I added two nice little links to the head of this document.
<link rel="Validate" href="http://validator.w3.org/check?uri=http%3A%2F%2Fhome.planet.nl%2F~acjbizar%2Fweblog%2F" title="W3C MarkUp Validation Service" />
<link rel="Validate" href="http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fhome.planet.nl%2F%7Eacjbizar%2Fstylesheets%2Fdefault.css&warning=1&profile=css2&usermedium=all" title="W3C CSS Validator results" />
I thought it was kind of ironic that adding the link to the page that says this page uses valid CSS caused 18 errors in the Markup validation.
Easy fix though, just had to replace & with &.