You could always run the PS3 linux and then try to run the elf files that way, or when the new version of PCSX2 comes out it will support linux so you could play PS2 backups that way.
Sadly the PS3 Linux kernel lacks drivers for the RSX graphics chip. There is only frame buffer support currently. Some how I doubt PCSX2 will get playable speeds with just software rendering, even on PS3.
If Sony adds support drivers for RSX then a PS3 Cell optimized PCSX2 port would be awesome.