Recently I was dueling a lot on my shadow priest and I was in need of the addon that will monitor various enemy cooldowns (cc, offensive and defensive, trinkets). I was not totally satisfied with existing implementations both aesthetically and in terms of functionality, so I wrote this addon.
Sequenced is somewhat comparable to InterruptBar and Juked, but takes another approach (time sorting) in a placement of spell icons. It was written with focus on flexibility of configuration (spell tagging, various profiles etc).
For more details: http://www.curse.com/addons/wow/sequenced
I hope that pvp players will find this addon useful and if not, well at least they can tell me what they disliked the most about Sequenced here :)