[Michael Grinberg]

Once again, everyone, thanks for helping.
Now if you open Allen's GTD, you will see how firmly the author insists you should process your inbox as a stack, not even looking under the topmost item. In fact, I'm not sure whether the same thing is really required when doing things, but it's crucial exactly for inbox... And it's crucial for "reviewing".
I would add that simply implementing the next action view wouldn't be enough for me, as I would like to see something big, bold, and maybe something spanning across the screen (In fact, this would be great when doing things as well)