I'm not sure how formal or possibly influential this could be. It may just be some interactivity to drum up a little traffic. But the Amazon HD DVD page is asking for you to tell them what titles you want to see on HD DVD.
Scroll down towards the bottom of this page: http://www.amazon.com/hddvd and you will see this:
Tell Us What You Want To See on HD DVD
HD DVD is a young, but rapidly growing format, and new titles are being added all the time. What movies do you want to see released on HD DVD? Submit your answer below and we'll reveal some of them here in coming weeks.
The movie I'd really like to see on HD DVD is: ...with a text box. Once you hit submit, it just refreshes the page. So you may be able to submit as many titles as you like.

I submitted studio canal imports;can't hurt

Put a lot of Blu-ray exclusive titles in might be a neat trick .
Cool if we can get more studio support .
Niether side is complete with out neutrality !!

Bob

Here are the ones I added:

Band of Brothers Series
Deadwood Series
Entourage Series
Saving Private Ryan
Studio Canal Imports
Jurassic Park Trilogy
Lord of the Rings Trilogy

Only thing I put was the only movie I have to have..... Jurassic Park.