I use Forte Xorcist to track my CDs and ICDs (for trinkets, lightweave, power torrent, etc.)
I took a few screenies so you could see how you can set it up. Here you can see a few CDs tracked on mine: PW:S, Weakened Soul debuff, Lightweave ICD, Dispersion, and Hymn of Hope. http://www.equineinspirations.com/wow/forte.jpg
And here you can see the larger "splash" icons that happen when the spell comes off CD. I have mine set to show the small splash right on the tracker, and a larger splash in the middle of my screen to draw attention to it. http://www.equineinspirations.com/wow/fortesplash.jpg
I'm not really sure if this is the type of thing you're looking for, but it does track things that aren't on your bars. You can set it up to be vertical, hide when out of combat, hide when there are no CDs being tracked, and you can change how long/tall the bar is, etc. I also use Forte for my dot timers, and I quite enjoy it.
Anyway, hope that at least helps you a little, and if that's not the type of thing you're looking for, I hope you can find the perfect thing to suit you! :-)