Here are a couple of videos from E3.
Here's Sony's presentation of their new motion controller.
And here's a polished Ad-style video of Microsoft's Project Natal.
I think they're both very exciting and will be must-buy peripherals respectively. I thought Natal looked good, but then saw the PS3 demo. The PS3's high precision and buttons might make more serious gamer friendly, but I guess we'll just have to see what happens when they come out...