Another cool trick: Acorn image editor can take screenshots of the whole desktop environment (all windows, menus, etc) and put them in separate layers. You can then rearrange them as you wish.
That's a great idea. Capture the data first, then sort it out.
The new GNONE screenshot tool is similar because it capurures everything as soon as you hit Print Screen, but it still forces you to decide what to save immediately. It would be nice if has an option to save everything so you can pick out what you want in post.
I also want something like this for audio. Record every audio stream on my machine as different tracks. Then I can select which ones I want later.