This is just a rough start for such an addon. ^^ My friend wanted an addon that keeps a count of how many Val'kyr he had up. The message spam is only a debugging measure--I wanted the core functionality working before I developed any kind of interface for it--that's just how I prefer to develop. Here's the start of the interface if you're curious:
Notice that it's the "start" of the interface. ;p It's not very pretty.