Lawr gave up Perkins and Rodeney for Carlos Santana, with some other bits involved. Lawr wrote it up, quoting from Jeff’s extensive analysis.
This past week in Tout NL Rotoman traded Rafael Soriano to Brian Walton for Eric Young Jr, using a similar calculation. (Not many points to lose in Saves, Rotoman said to himself, and a lot of need for a hitter and steals particularly. Plus the next three guys ahead of Brian in saves are ahead of Rotoman in the standings.)
The bottom line is that at this time of year the value of closers is diminished, because at least a few teams have no need for them, and a few others can’t afford to swap anything away. But finding a good match is an an important part of maximizing your team’s points.