Downloading single images is cool, but even cooler would be to enable a "lightbox" feature whereby you can add selected images from each content folder as you view them (into a selection box), and then get them all downloaded as a zip file once you have finished browsing.
Even better, would be the ability to download different sizes of the uploaded image. e.g. If I upload an image 2240x1488 I should be able to download reduced sizes, say 50%, 25% etc...
Typing this I now think I should probably just put this into the 2.1 wishlist...