I found some really nice footage of f1 in the 50′s, 60′s, 70′s and 80′s. I even have found fantastic footage of the 1929-35 Monaco GP!
http://www.youtube.com/watch?v=WAXhktcW7b4&feature=mfu_in_order&list=UL This guys channel is filled with Monaco footage.
http://www.xtremeracers.info/forums/viewtopic.php?f=64&t=6479 Season reviews from 1970 to 1990! Some awesome footage!
http://www.youtube.com/watch?v=5M-A-r3TSHY This guy also has plenty of good footage.
Enjoy, and post your finds!