Here's an interesting bit referenced in the Note today pertaining to Rove-Gate (emphasis mine):
At one point, the aides were asked why Mr. Cooper's call to Mr. Rove was not entered in Mr. Rove's office telephone logs. There was no record of the call, the person who has been briefed said, because Mr. Cooper did not call Mr. Rove directly, but was transferred to his office from a White House switchboard.
The Note
All I can say is, "how conveenient".