A diff of past front pages would be interesting. Some historical front page entries:
2007AUG15 ~ http://www.flickr.com/photos/bootload/1119991071/
2008FEB08 ~ http://www.flickr.com/photos/bootload/2250089864/
2009JAN18 ~ http://www.flickr.com/photos/bootload/3205568708/
2009MAR12 ~ http://www.flickr.com/photos/bootload/3347109733/
2010JUN24 ~ http://www.flickr.com/photos/bootload/4728476663