I'm displaying a slideshow of images by using the SupersizedDir custom field with a value of "wp-gallery".
However, it's not working in IE7 or 8 and I've tracked it down to the fact that there is a comma on the last image in the array of images in the jQuery output in the head.
I've corrected this by changing line 717 to:
$full_output = substr( $full_output, 0, -1 )."\n";