Welp, Perles' off the defense policy board.

Richard Perle resigned as chairman of the Defense Policy Board, an independent group that advises Secretary of Defense Donald Rumsfeld. But he will remain on the board at Rumsfeld's request.
Perle, a strong conservative advocate for the Bush administration's hard-line approach to Iraqi leader Saddam Hussein, said he was resigning because "I cannot quickly or easily quell criticism of me based on errors of fact concerning my [business] activities."

I doubt this will mean much... his access to this administration and its officials isn't really limited to that policy board gig. Nor will he stop being a convenient "senior government official" for anonymous sourcing for the media, as he will retain his seat.

At best, this will simply mean he can't call journalists terrorists with quite so much ease.