The Nowherelese site has spotted a non-official PSP and DS emulators for the new iPhone GS.
engadget points out that, "The revved up hardware in Apple's latest (phone) is apparently capable of running either of these at 150 - 225fps with zero frameskipping". While Pocketgamer says, "In both cases, you'd need to acquire your own BIOS from the original machine, which keeps the emulator developers just on this side of legal, but what's really being demonstrated here is the extra gaming oomph of the 3GS."
Have a look at video below to see how such emulatory goodness works. When we say, "such" in this case we mean the available footage of Final Fantasy VII PSOne and a GBA version of Pokemon from ZodTTD.com.