It's an interesting topic. SSDs with SandForce controllers use proprietary data compression to increase silicon lifespan and speed-up the bandwidth.
My 240 GB Corsair Force GT recently died. I disassembled it and the thing looks straightforward - SandForce controller and bunch of ICs. Anyway, be really careful connecting a SATA cable to such SSDs!
Replaced it with 240 GB Corsair Force GS (85000 IOPS -> 90000 IOPS)
I think it would be interesting to reverse engineer this compression algorithm. My guesses, SandForce HW compression is similar to the NTFS' LZSS.