My new laptop (Window 7) came with two 3.0 USB ports an one 2.0 port.
I just got a 3.0 card reader and did a little comparison using a CF card with raw files.
transferring 3.56GB from flash card to laptop (Window 7)
using 2.0 connection it takes about 7 minutes and 20 seconds
using 3.0 connection it takes 1 minute and 15 seconds
My laptop does not have a built in reader that accepts CF cards.