Ok? Do you mean “Ok” or “Ok”?

Everybody knows and uses the acronym “O.K.” several times a day. But, where’s the origin of those two well-know letters?

Google sent me tons of URLs… Not very easy to make his own opinion!
Here are 3 interesting links:
LINGUIST List 4.694: Etymology of OK
Etymology of Okay
The word “OK” – a linguistic virus