Some of Clinton's executive privilege claims were clearly fatuous. But not all.
There is a natural contention between Congress and the Executive Branch. I don't think it's reasonable to assume that Congress has a right to see every transcript of every conversation held in the White House or the Justice Department. Especially if it's going to be released to the press upon receipt.
This is a game of chicken and an attempt by Bush to protect as much as he can. Burton will negotiate and there'll be a mutual agreement for the release of some documents or redacted documents.
This happens in every administration.