It would be useful to have a custom "Dashboard" page (similar to the Overview page) where you can arrange certain lists or smart lists. The idea would be to create something similar to iGoogle, but with whatever lists / smart lists you want. That way you get a great at-a-glance overview of what needs doing.

For instance, you could have a custom list that only shows things that are priority one and due today right in the middle of the screen so it gets the attention it deserves, while keeping a list of tasks for a current project in the upper right corner so you don't let it fall to the way side, etc. etc.

I think this one-glance overview would save a lot of time and really promote the GTD strategy.