You mean whether you can stream Steam's Big Picture mode? Short version: no.
Long version: sure you could, setting up some capturing software, exposing that stream via UPNP in a format the PS3 support...lot of work to no gain, why would you want to stream it to your PS3? To get the output on your TV?
You'd have to deal with too much input lag even if you were to get it to work. Just get a long HDMI cable, problem solved (assuming you have HDMI on your videocard, DVI + separate audio out will do just fine as well otherwise).
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