At least in the version that I'm using (v2.43), the FlickrDown Progress window has a checkbox in front of each of the images. It appeared to me, as a novice user of FlickrDown, that I was supposed to check the box of the images that I wanted to download.
This appearantly was not the case. If the box was eliminated, yet the checkmark still present after each image was downloaded, this would make it less confusing to novice users.
I'm running Windows XP SP3 (if this makes any difference).