I've made a bit of noise about how cool the iSight/iChat combo is for videoconferencing, so I thought I'd post something showing why I think it's so great.
This image (reduced in size for easy blog-o-display) shows you what a conversation with, for example, my mom is like over iChat:

The really cool thing is that this is coming through at 15 FPS with reasonably high-quality sound (about on par with a decent cell connection). We're bandwidth limited on her end (actually my grandma's connection) to cable speeds, so it's still possible to get an even better experience.
When Kori and I use MSN IM for videoconferencing, we get an image that's half the size, transmits at about one frame every two seconds, and provides no sound.
That, my friends, is why I'm so smitten with iSight/iChat.