I dont know if it was posted before but I just got my Sandisk M2 8GB with Pro Duo adapter in retail package of course. Anyhow, I inserted it on my PSP and it was detected and now Im currently transfering files. The thing is so small, its even smaller than MicroSD. Transfering files is somewhat slow, I dont know it its slower or faster then my regular 4GB MS as I dont really time them. Anyhow, just a heads up for anyone with cash that will be buying M2 with higher capacity, I dont know if it works on official firmware tho.