The Ohio State Beekeepers Association has recently posted a great video series on its website: http://www.ohiostatebeekeepers.org/beekeeping_class/

They cover pretty basic topics (eg "How to Light a Smoker") to some rather advanced topics (eg "[Identifying and Fixing] Laying Workers").

Also, there is a link to a free copy of Dr. Jim Tew's book "Backyard Beekeeping"