FC2Video

Windows
http://www.delphiforfun.org/Programs/Utilities/list_large_files.htm

Also see to clear search / personal history:
http://www.ccleaner.com/
http://www.stevengould.org/index.php?option=com_content&task=view&id=29&Itemid=72

MAC
http://grandperspectiv.sourceforge.net/
http://www.jgoodies.com/freeware/jdiskreport/
http://www.id-design.com/software/whatsize/

Also all the programs in delphi for fun's site contain the sourcecode so if you're looking to learn delphi it's an awesome site.
http://www.delphiforfun.org/Programs/index.htm

Also in windows when you go to add or remove programs in the control panel you can order by size.

Also for youtube news mrpregnant has been suspended, not that I liked his channel much. He definitely is a big character here though
http://www.youtube.com/watch?v=og4vSwG0DqU