All of you Death Knights out there might be interested in this: It’s a Rune Management addon which, well, I’ll let the author describe it:
Runevolution is a small rune tracking addon. The intent is to provide a “stack” of your ready runes, so they pile up on your screen in the order you used them. This means your rotation is reflected in the rune positions on your screen.
Cooldowns are tracked by moving the runes towards the “stack” of ready runes. Therefore the order that runes will be ready is also available on the screen.
Here’s the movie and the download link: Death Knight Runevolution