for "old timers" - revisiting a commentary by Claude Shannon

[Samudra Haque]

http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1056774

Shannon, C.E. The Bandwagon. IRE Transactions  - Information Theory. 
1956. p3.

So I ask you, what is the most significant discovery in communication 
theory in recent times your opinion? Error correcting codes - modulation 
schemes - others ?