Drivers SIL3132 ExpressCard eSATA/PCI-Express SATA
Here it is, Silicon Images posted Snow Leopard 10.6 SIS3132 ExpressCard eSATA Drivers. These drivers are beta, and supports PIC-express SATA SIL3132 cards too.
I am copying 834GB from a 2TB FAT32 SATA drive to a 1TB HFS+ SATA Drive on my MacBook Pro, and the speed is impressive, around 100MB/s, 4X faster than USB 2.0 real-world speed 
Beware that these drivers are beta, without any warranty, and should not be considered at this point as production drivers, but still this is a solution for those like me that have a MacBook Pro w/ ExpressCard eSATA SIL3132 controller (real MacBook Pro have ExpressCards, other are just MacBook in disguise 
)
Go to Silicon Image download page for SIL3132 Mac OS X 10.6 Snow Leopard Drivers (second one)
PS: Finally was 90MB/s thouput for hard-drive copy on eSATA with 25$ eSATA ExpressCard/34! 3X time faster than fastest USB 2.0 hard-drives!
