When viewing an individual picture or a slideshow (in the intermediate size, not full-size), it's the same size as the thumbnails. It might be nice to have a size in between the thumbnail and the full-sized image.
Also, not really Plogger related, but is there a reason for cropping the images to a 3x1 aspect ratio?
I was going to ask how to implement the intermediate version... but figured it out :) all fixed now.
Yes there is a reason for the crop, the pictures are meant to be used as "website headers". So the photos have been taken in such a manner so that there is free space for a textual message... and the main subject is not centric or non-existent. I felt the length and width chosen is typical of many website which employ header usage.
I did up an amusing little storey you all might enjoy for this photo... http://hipheaders.com/animal_photos/farm_animals/000051.jpg