here is a huge collection of corporate logos....just about every company you can think of...they are all vector eps files (you might need adobe illustrator to use em)
logos.rar 115 megs
http://www.megaupload.com/?d=YZV4YEMH
logos.rar 115 megs
http://www.megaupload.com/?d=YZV4YEMH