A highly entertaining, but poignant talk by David Pogue (2006, TED) on simplicity that fails to permeate much of the technology we use or design. One of the best lines (for me) comes toward the end. Speaking primarily of hardware and software, but I feel is equally relevant to instruction and CONTENT, Pogue says...
"The hard part is not knowing what features to add, but deciding what to leave out!"
-Joel G.