That new PS3 firmware we mentioned yesterday has gone live.
The 3.15 update includes the option to transfer data between two PS3s in order to help people who need to move their stuff to a new console.
It also introduces the option to download and play PSP minis on the PS3 via an emulator.
However, the minis themselves will not be made available until next Thursday, 17th December, when Sony hopes to have "the majority" of existing ones available.
Beyond that, all future PSP minis should work on both PSP and PS3.