While I totally support the idea of PS1 on the PS3, why not just play them on the PC? Even a netbook can play them at full speed. My android phone, not so much.
Besides, some ps1 games are great with a mouse. The only downside of a PC option is that no one is really developing the emulator anymore. I hope PCSX2 decides to add it once there PS2 emulation is done. In about eight years.
Anyway, I'm sure someone is going to dump the USB soon. What I'd really like is PS2 BC on slim systems, but that IS asking for too much. At least for now.