What I noticed about my videos were that the colors in the MPEG were a bit more muted and that blue and green was more pronounced. Not the range of colors I saw with the AVI.
Yeah, those primers are full of info, but in a summarized fashion which brings together all of the little pieces of information. I figured out numerous issues from this such as reduced color in my DVDs, upper/lower frames (no problem on a computer screen where images are displayed progressively, but required when creating an MPEG to display on a television, Otherwise it's a jittery during movement), the difference between composite and S video connections.
They also have a good one about compression for the Web.
You have to read them a couple of times. Then all the little pieces and your experiences start making sense.
I used in HD camera from work. I quickly discovered that the volume of data involved in capturing is beyond the capability of most casual users at the moment. Additionally, the increased processing time also will make adoption difficult for the casual user. I had thoughts of stepping up, but the requisite increase in infrastructure requirements and the increased time to process isn't worth it to me. System performance needs to increase to get processing time down and that price point then needs to come down from there.