The folks at PSPHardware have released their memory stick adapter which allows the PSP to use all of the standard Sony memory stick formats. They cost $25.00 each and the shipping is $4.00 for priority mail within the US and standard mail outside the US. They test each unit before it is shipped, and offer a 30 day return policy. You can purchase one via this link. They are currently out of stock, but expect to see some more becoming available within the next day or two.