Mike Tyson is known for the one punch knock out. Watch these ten in this video. More to come.

http://www.youtube.com/watch?v=e7wUOCADxq0

Lennox Lewis knocks out Mike Tyson:
http://www.youtube.com/watch?v=kD9Cf_dAVdg

Hasim Rahman KO Lennox Lewis
http://www.youtube.com/watch?v=ABZu5v2JPuE

Muhammad Ali vs George Foreman
http://www.youtube.com/watch?v=Kf64ZCYVcEI

Two Guys Get Knocked Out
http://www.youtube.com/watch?v=w7_V72NrMdI

THE Slap
http://www.youtube.com/watch?v=LMbubF5z7GE

Boxer Knocked Out and Still Punching
http://www.youtube.com/watch?v=5wNrB_V3PFc

Kiss of Death
http://www.youtube.com/watch?v=loVqGHxFwmE

Boxing Brutal Knockouts
http://www.youtube.com/watch?v=IUzil_88ZVw

The Greatest Knockouts of the Past 30 Years http://www.youtube.com/watch?v=YnFh_N5zATo
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PERFECT FORM!
http://www.youtube.com/watch?v=C1zTrEFOyO4
(note: I do not approve of the views expressed in this video)


Two-in-one
http://www.youtube.com/watch?v=bqGsZzwPD94


Watch what you ask for:
http://www.youtube.com/watch?v=-ieV3dCdrPU


Kiss of death
http://www.youtube.com/watch?v=eDafeHoypnA


Never give up!
http://www.youtube.com/watch?v=xndD7PmnxAs


Does this count as a punch....? lol
http://www.youtube.com/watch?v=KC2t-p0eFCE


Sneak-attack foiled
http://www.youtube.com/watch?v=-hhC0_mpoEg


Guess which hand.....?
http://www.youtube.com/watch?v=3HP9Ai9cYXU


Collateral damage:
http://www.youtube.com/watch?v=xxAJzKzX-ks



This isn't a punch, but I think I've lol'ed at this knockout more than any other.
http://www.youtube.com/watch?v=8kChDiQVAAE
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I think this six minute YouTube Video, Pretty Much Summarizes and answers your question beautifully. Additional resources can be found at the link given below its a boxing forum.

Also there is compilation of lists by various people ,some are:

Sugar Ray Robinson KO5 over Gene Fullmer (2nd fight) Perfect left hook.

Thomas Hearns KO2 over Roberto Duran (possibly the most complete knockout I've ever seen)

Floyd Patterson KO5 over Ingemar Johansson. Left hook left Johansson out cold with his foot twitching on canvas.

Bob Foster KO4 over Dick Tiger. Perfectly time punch left Tiger completely out.

Bob Foster KO4 over Mike Quarry. Quarry bombed as he was coming in. Out cold!

Rocky Marciano KO13 over Jersey Joe Walcott. Perfect right hand left Walcott in a heap on the canvas.

Jersey Joe Walcott KO 7 over Ezzard Charles (3rd fight) Charles caught with perfect shot from Walcott.

Bob Fitzsimmons KO14 over James J. Corbett. Body shot to the solar plexus made title change hands.

Joe Louis KO4 over Paulino Uzcdun. Perfect punch from the Brown Bomber left iron jawed Uzcdun in a heap on the canvas.

Julian Jackson KO2 over Terry Norris. Jackson is well known for his great one punch knockout prowess.

Check out the links and I sure hope you find them helpful.
Source(s):
http://www.saddoboxing.com/boxingforum/11605-best-knockout-punch-ever.html
http://answers.yahoo.com/question/index?qid=20080328135321AAfotEf

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Top 10 Greatest Knockouts Ever
http://au.youtube.com/watch?v=T4bDdjgVtAc

Top 10 Most Brutal Knockouts Ever
http://au.youtube.com/watch?v=C69SNL5IdT4
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I'm a big MMA fan, so I'll give you a few terrific MMA KOs of the past 2 years:
-Quinton Jackson vs Wanderlei Silva III
-Quinton Jackson vs. Chuck Liddell II
-Rich Franklin vs. Nate Quarry
-Junior Dos Santos vs. Fabricio Werdum
-Melvin Manhoef vs. Mark Hunt
Source(s):
-knowledge
-http://www.brigadeqm.com

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