http://webhotornot.com/

it might be interesting to compare this to the blogoscope version

http://www.hotornotdesigns.com/

Using graphics instead of a direct link to the site seems to be the more sensible solution than my approach, at least if you consider that some sites load slowly.

By the way, does anyone know of a good free screenshot maker (taking a hi-res pic of a website, not just a thumbnail) that works online?