http://wowinterface.com/downloads/in...NinjaYell.html
NinjaYell was designed with the intention of delivering the functionality of mods such as CastYeller or CCBreaker, without all the memory usage and bloat-ation(?).
Only real drawback is that you must edit the lua files yourself to 'config' it. This shouldn't be a problem for anyone with any kind of programming experience, large or small, and I did my best to write a 'noob-frienldy' how to on the page.
Try it out, let me know what you think!