I am delighted to have noticed that the wonderful folk at scran have improved their blog this facility.
I noticed this a while back, but at that time it just supported scribble and elgg, I suggested this could be extended to a flickr like blog this, or even giving an html fragment. It now does, and I am testing it out.
Here is an interface screenshot:
I had a wee bit of difficulty with some of the links, but it looks like this could be a great tool of children to write blog posts about the images on scran.