the upnp enabled option you see on the PS3 has absolutely NOTHING to do with the upnp av standards, its used for nat traversal only.. Its for those people too ignorant to figure out how to open/forward ports from there router when behind a NAT, and almost everyone using a PS3 is behind a NAT.
I have upnp disabled on my router, the ports forwarded manually, I have no problems getting the ps3 online or using PS3MS to stream media from my computer.
