I could not find any such list on the forum, thus am proposing to start a list of full archived marathon videos online. Perhaps there is already a site or such that I am unaware of, but I have found that it really takes a good hunt to find full-length videos of past marathons. Anyway, here's a couple I've found, and hopefully we can get a nice list going here.
2008 - Berlin :
http://v.youku.com/v_show/id_XNDUwOTU3NDQ=.html
2011 - Miami :
http://www.youtube.com/watch?v=IFMuvLSbGd0
(part 1)
http://www.youtube.com/watch?v=pJkI3yx3A1A&feature=related
(part 2)