http://garden.org/thread/view_...
I saw a strange thumbnail in the post above. I THINK that the first time I saw it, it didn't have all that white space, or I would have noticed it. But it was the sixth image in a post, so I MIGHT not have noticed it on the first pass. (The first five thumbnails look normal.)
Is that thumbnail "wrong"? Or are you experimenting with thumbnail compression and centering?