Here is what I currently have set up:
Denon 2806 (HDMI monitor out) connected to Panasonic AE900 (HDMI in) via 15ft HDMI cable (Monoprice HDMI to HDMI CL2 rated 24AWG gold plated cable).
I have one Panasonic DVD player connected to the Denon via regular RCA cables for audio and video. I have one Panasonic DVD player connected to the Denon via S-Video cable and regular RCA cables for audio.
At this point, I am just testing connections and hoped to be able to convert all of my analog signals to the HDMI output through the Denon. I haven't purchased my final DVD player yet, so I don't have direct HDMI output on my DVD player (yet). The Denon is the only source component that I have that has HDMI capabilities at this point.
If I go directly from one of my DVD players to the projector, via S-video or RCA cable, it picks up the signal just fine. In all cases, the Denon plays the audio just fine.