I would like the ability to zoom in (magnify whole the screen), like Compiz does.

Use cases for this:
- you are in a presentation/demo in a conference, or making video tutorials, and want to show something to the audience that is hard to see or to bring attention to it
- you are reading something that is too small for your screen, or want to temporarily enlarge it (ie: your monitor has limitations -- too small or resolution too high)

Thanks!