Hawass seems to think he discovered Khufu's ramp but having read what Jon B posted, I am not entirely sure what Hawass discovered. Also, the dimensions quoted seem a little suspect (centimeters?):
III. 2. The Discovery of the Ramp.
During the work of relocating the Sound and Light Show cables at Giza, we were able to excavate their route beginning at the Southwest of the Great Pyramid.
Also at this time we started the re-excavation of the cemetery GIS and the restoration of the tombs there.
As was discussed above the only possible side for the erection of the ramp during the reign of Khufu was the South side. The ramp was constructed of limestone chips, gypsum, and a calcareous clay called Tafla. Due to the hardiness of the construction materials what remains of the ramp, after the Egyptians removed it to build the tombs of GIS, should still exist on the South side.
We started to remove sand for the erection of the cables North of the paved road and South of the pyramid. During the work we found a big part of the ramp used to transport the stones from the quarry to the pyramid base. This part of the ramp consisted of two walls built of stone rubble and mixed with Tafla. The area in between was filled with sand and gypsum forming the bulk of the ramp.
1. The West Wall:
The length of this wall is 1.40 centimeters, built of a stone rubble and Tafla.
The length is 60 centimeters. Mud was used to consolidate the stones.
2. The Eastern Wall
It is located to the East of the West wall about 1.50 centimeters. The width is 1.45 centimeters and it is also built of stone rubble.
On the South side of the paved road, South of Khufu's pyramid, we excavated down about 2.50 meters and found another part of the ramp. This part is in line with the Eastern and Western wall and is of similar construction. This discovery proves that the ramp led from the quarry to the Southwest comer of the pyramid and was made of stone rubble and Tafla.(see plans 2,3) The ramp rises to about 30 meters above the pyramid's base at its Southwest comer. The ramp would have leaned against the pyramid's faces as they rose. Somewhat like accretion layers wrapped around the pyramid with a roadway on top. The weight of this ramp is borne by the ground around the pyramid. Traffic could move along the top of this structure as both pyramid and ramp rose in tandem. The top of the pyramid could be reached with only one and one quarter turns. The slope would rise with each turn from a reasonable 65 degrees, for the first section, to as much as 18 degrees for the last climb to the apex. 19 - Dr. Z. Hawass