It seems Flickr have changed how their photos are linked, the URLs having changed from photos2x.flickr.blah to static.flickr.blah. Translation? All the pictures you linked to in your Blog no longer work. Luckily I only had two so going back and changing the URLs wasn’t too arduous. I don’t envy the people who have been photo-blogging extensively though…
(Amusingly, Flickr themselves have fallen foul of this!)

On a related note I, like Andy, have upgraded to Flickr Pro account. No ads, unlimited sets and no monthly quota.