I keep reading in various articles that someone "pleaded guilty" or "pleaded not guilty." I've always thought it was "pled" when used in this manner.

Big* discussion at the weekly editorial meeting when I was a reporter and covered the courts. Pleaded is correct although it is often spoken as pled. Course the Word came from The Editor and one does not question The Editor.

(Why does Editor have a cap E?
For the same reason God has a cap G.)