d-SLR Timing Performance Parameter Nikon D70 Canon Digital Rebel Nikon D100 Canon
EOS-10D Startup "Instant" 3.09 0.63 2.32 AF Lag 0.34-0.49 0.25-0.28 0.150 0.146 Prefocus Lag 0.124 0.142 0.100 0.104 Cycle Time 0.34
(2.92 fps) 0.40
(2.50 fps) 0.35
(2.88 fps) 0.34
(2.94 fps) Buffer Depth 9 - 100+ 4 7-9 0
This is one test with the fastest cards in situ and the camera are rated at 3fps the end results show that the camera is not going to be faster than the quoted top cycle  speed. remains constant despite variations in lag times etc  

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt