Yes, I vaguely recall that another CD had been found. This is all I could find on it, but it appears to have been created by Mehlman:
"For Democrats who spend a good deal of their time looking for the Mark of Rove, an exciting moment came in June, 2002, when a backup computer disk was found in Lafayette Park, across from the White House, containing two PowerPoint presentations, one by Kenneth Mehlman, Rove's deputy and the White House political director, called "The 2002 Challenge," and the other by Rove himself, called "The Strategic Landscape." (Inevitably, speculation has begun over whether the Lafayette Park PowerPoint, as it has been referred to, is the Rosetta stone to the mind of Karl Rove or a piece of deliberate disinformation designed to throw the Democrats off the scent.)"
Source: http://www.mydd.com/section/general