It's really amazing how different the situation is when compared to Japan. There we get a weekly top 50, Hardware numbers for everything including PS2/PSPgo/DSL/etc, monthly numbers and sometimes top software for individual platforms, as well as a yearly top 100/500/1000, sell-through amounts for new releases. Not to mention the fact that there are multiple trackers to compare to each other.
With NPD seems like we're going to get a monthly top 10, and the only SW/HW numbers will come from the publishers.