The First Balanced Scorecard. 
The first balanced scorecard was developed at Analog Devices in 1987 and is still in use today.  You can read about its development and refinement from 1986 through 1992.

How to Build a Balanced Scorecard.
To successfully create and use a BSC an organization must translate its strategy into the language of its various stakeholders and then identify the critical process improvements that will lead to their satisfaction and delight.  This three-part e-article describes how to do it using a step-by-step process.

Why Balanced Scorecards Fail

Juggling Balanced Scorecard Metrics

Must Your Scorecard be Balanced?

Current thoughts on the subject.