1-Well, I have one HDMI input on my RPTV.
2-And until recently only had 1 DVi>HDMI device being my cable box. However, I picked up the Toshiba HD- DVD (which I later returned-tech isn't ready yet) and it was HDMI. So, I swung by Best Buy and they had a $150 MANUAL HDMI switch and I had no choice but to get it. Luckily, I returned the Toshiba and that allowed me the chance to return the HDMI switch to Best Buy. However, I will be picking up the next Gen Toshiba HD-DVD player and have PlayStation 3 on pre-order and want to get the Panasonic XR57 which is an HDMI AVR. To answer question #2, very shortly I could have up to 4 HDMI devices, go figure