According to Tom's hardware guide (tomshardware.com/Celeronto100.html) you can get all 66 MHz Slot 1 CPU's to run at 100 MHz on a BX board by simply covering the B21 pin on the P-II's connectors.
I've heard that Intel changed this, and ships the newer P-II's with a safeguard against taping off the B21 pin. Can anyone tell me if this is true? Are the newer P-II's "fixed" to keep overclockers from hiding the B21 pin??