Improved Icy Touch is a death knight talent located on tier 1 of the Frost tree. It is a requirement for taking [Icy Talons] deeper in the tree. On its own, the talent is primarily useful for tanks, although it has some use in player versus player combat too by slowing down your opponent. For a tank, the talent is valuable both because it increases the damage (and thus threat) caused by [Icy Touch] and because it increases the slowing effect of [Frost Fever], which helps reduce incoming damage. Because of this, the talent is popular even with Blood and Unholy specced tanks.
Notes[]
By reducing attack speed further, the talent reduces the damage you take over time from enemy auto-attacks by 7%.
The slowing effect does not stack with other similar effects such as protection paladins' [Judgements of the Just], protection warriors' [Improved Thunder Clap] or feral druids' [Infected Wounds]. When fully talented, all of these abilities provide the exact same attack speed reduction.
[Icy Touch], 
[Frost Fever]
[Icy Talons] deeper in the tree. On its own, the talent is primarily useful for tanks, although it has some use in player versus player combat too by slowing down your opponent. For a tank, the talent is valuable both because it increases the damage (and thus threat) caused by 
[Judgements of the Just], protection warriors' 
