Donkey Kong Country TAS by Tompa in 08:13.72
Explanations to the run can be found here: http://tasvideos.org/3075S.html.
This is a Tool Assisted recording. Meaning it was recorded using an emulator with slow motion, save states and rerecording.
Visit http://tasvideos.org/ for more information on tool-assisted speedruns, and to watch the many already-existing TASes.