I just picked up a 37" Panny Plasma, and a Panny Diga (DVD player, recorder, VHS combo with HDMI. The Diga and plasma talk to each other via HDMI, which is a feature Panasonic calls HDAVI. The benefit is that the various components will automatically configure themselves based on events, such as a DVD being started, or the TV being turned off, etc.. I have something similar on my previous JVC rig using the Compu-link system.
This HDAVI helps greatly with the WAF. I am also very happy with the PQ from the panny DVD. It upverts the DVD signal nicely, resulting in a picture that look like HD. The VHS and built in tuner also output via HDMI, which simplifies things greatly.
I plan on getting an XR57 to complete the picture, so to speak, but am a little conerned about the performance. Can anyone comment on how the quality of this model?