Every time I think I've mastered all the coolest keyboard shortcuts, along comes another one that somehow flew below my radar.
For example, like many folks, I spend a considerable amount of time using Microsoft Word. And I thought I knew all the best shortcuts, like using the Home and End keys to jump my cursor around a document, and, of course, the venerable cut/copy/paste commands. But here's one more great pair of shortcuts for folks who prefer to keep their fingers on their keys and off their mouse: Alt-Shift-Up Arrow and Alt-Shift-Down Arrow.
When you place your cursor anywhere inside a paragraph and press either key combination, that paragraph jumps up or down, effectively switching places with the paragraph above or below it.