http://en.wikipedia.org/wiki/Production_logo
http://en.wikipedia.org/wiki/Leo_the_Lion_%28MGM%29
http://en.wikipedia.org/wiki/Columbia_Pictures#Logo
http://tv.groups.yahoo.com/group/closinglogogroup
http://members.fortunecity.com/teamfx2000
http://logos.ctufilms.com
There was a Megamix made of many logos, but it is currently offline as it is being remastered.