With TBC introduced, my class mage has gotten a new spell introduced, Ice Lance.
I feel that it would be very handy if an addon to scrolling combat text or something equal said like: Frostbite!
Because when in an instance group it can be hard to see if frostbite procc's.
And since ice lance does 3x dmg on frozen targets it would be nice with this message to appear.
A nice feature could be to block casting of frost nova while frostbite is active aswell.
I do this mistake often, since frostbite tends to procc right when im about ot frostnova the mob :P
U could take the blocking method from Vendetta bossmobs maby.
Its blocking heals durring priest's class call in the nefarian encounter.
I second that request and additionally i would like to see a notification if the target is dazed, for there are several new skills that deal extra damage on dazed targets, like steady shot or the new heroic strike.