I used to use DBM Spell timers I believe is what it is called. All you have to do is enter the code for the spell (you can usually just look it up on the net) that you want to track...and whenever that spell is on CD it will pop up on the side letting you know just like any other DBM timer when it comes back up. It was easy to use and get used to...plus almost everyone uses DBM anyways so as long as you know how it works you can set it up nice and easy. I have taken a long break from WoW though so there might be better options available...I just remember using it and finding it easy to set up and it didn't clutter my screen...but I only used it for major CD's...mostly heal related...