http://speedplay.com/index.cfm?fuseacti ... ompareroad
is useful, but doesn't have all pedals.
The egg beater has a lower stack height than most other road and mountain pedals. Crank Brothers pedals have a stack height of only 15.2mm (0.600inch) which is 3mm - 5mm closer than many other pedals.
Crank Brothers apparently is being very selective as to which other pedals constitute "most". Time RXS have stack height of 12.5 mm and Time i-clic have stack height of 13 mm. Speedplays have 11.5 mm stack height for 3-hole mounting and 8.5 mm stack height for 4-hole mounting.