It reports the shipping lists as soon as they become available from Diamond Distributors. Conveniently breaks down listings by major comic book publishers. I appreciate the spotlight book feature.
My only negative is that I wish it reported before Diamond posted their list, as Midtown Comics does.
Answering the previous post:
These are lists for US distribution only.
You can use the list to determine what is available that week to your local comic book store for that week.