The best answer comes from the question and answer at the PlayStation Knowledge center and the first sentence from the related link below the answer is provided below:
The PlayStation 3 is not compatible with peripherals or controllers that plug into the controller ports of the PlayStation® (PS one™) console and the PlayStation®2 computer entertainment system.
There was also this additional information on adapters: Sony Computer Entertainment America (SCEA) does not have any information regarding adapters that will allow these peripherals to work on the PlayStation 3 system.
So at least the answer is that you can't without an Adapter not supported by Sony PS3
I think it is the PS3 that the PSP works well with together and not the PS2
no it can not you dumbo
No. The PS2 cannot use a PS3 disc.
it is called the ps2 controller not ps3 so not that i know you can do that
No
No
Yes, the memory card for the PS2 can indeed be used in the PS3 also.
Yes, there is an adapter that lets you use the controller for the PS2 with a PS3, it cost around $6.99.
No, you need PS3 controllers
No because the PS3 does not accept it...
no
yes