How is this even possible?Show me a gaget that does this for a DVD player or PC.
360 outputs ANALOG.+ PS3 HDMI is universal,any $10 HDMI wire will fit.
As far as I know, the xb360 gpu does not have integrated TMDS transmitters. If TMDS is to be supported, I think a TMDS transmitter chip is required (like what Silicon Image offers).
If your TV doesn't have an unoccupied component (or VGA) input, then some kind of analog-to-HDMI converter cable could be justified. However, we're speaking very hypothetically here, I believe the market for a $99 (or thereabouts) HDMI connection for the 360 would be VERY limited, so it's doubtful any manufacturer would actually want to design/build one.