..but here is the catch. You need to buy a PS/2 to PS3 adapter. Like something you need if you were to move data from a Xbox card to the new Xbox 360 by using 3rd party devices. The PS3 will have the same thing but you have to buy it from Sony.
Sony says that in order to use saved data on a PlayStation 2 memory card, you must copy data onto a virtual memory card that is mounted on the HD by default.
But does that mean you have to buy new memory cards so they would work with a PS3? The answer is no. Because the memory card adapter can edit, move data from memory cards.