I've been using Grooveshark for quite some time. Recently they have redesigned their site (the old site is still available at http://retro.grooveshark.com/). I can't find out where I can resize the current playlist and the cover art images.
In the old version it can be achieved by either clocking and dragging the four-horizontal-stripes button, or by clicking the "resize queue" button (4th icon in the image, before the gear and the volume slider).
However in the new version I can't find out how to change this setting. On different computers the images have different sizes and apparently no options on how to modify it.
Here's how it look on one of my computers (Chrome on Windows Vista):
Here's how it look on other of my computers (Firefox on ubuntu):