you said you cant split audio/video but then change your mind saying you can if you use the panasonic which only has 2 hdmi you need 3 hdmi to split a/v 1 cable in 2 cables out .
The Panasonic Blu-ray player linked above has two HDMI outputs - you connect one of these outputs to your TV to send 3D pictures direct, and the other HDMI output to your AV receiver to send the HD audio direct. So only two HDMI cables are required for this and it's one of the simplest methods of getting 3D if you don't have a 3D compatible AV receiver.
On the splitter question, whilst theoretically it should be possible for a 1.4 certified splitter to send the signal to both the TV for 3D and the amp for HD audio, I wasn't aware that there were any which had in fact been certified to do this. All the tests I've seen other people perform so far have indicated it's not possible, but happy to be proved wrong on this as I've done no actual testing myself.
I was under the impression that a new update for the PS3 now allowed 3D and HD audio to be sent to a compatible receiver (source here
), but I've not tested it myself. As noted above, with only one HDMI output, I believe you would therefore need a 3D compatible receiver for this to work. thank you professorhat the op has the new STR DH820 amp which is 3D compatible and like i said in my first reply would only need a 2nd hdmi cable