1. No, I did not know this. I believe video performance of HDMI is exactly the same as DVI. However, I do know that the latest version of HDMI (1.3, I think) will have the capability to pass hi-resolution, multi-channel audio (such as SACD and DVD-Audio). I listen to these formats today, but I can only use the analog outputs of my source player.
2. I do not have any HDMI components yet. I pass my video with component. However, with 1080p on the horizon, I am considering a major overhaul of my components and display towards the end of the year. At that time, HDMI support will be high on my list.