Jack's Mannequin did a great performance of Dark Blue at rehersals.com: http://www.rehearsals.com/news/article.jsp?ymd=20060731&content_id=1052&vkey=news&fext=.jsp
some people were even saying it's better than the album version

New Jack's Mannequin Song from the Superman Soundtrack, Meet Me At My Window has been leaked

Click your choice under "Listen Here" and then go to about 26:50