Some addons like SorrensTimers, DoTimer and CooldownTimers have an option to broadcast spell cooldowns and durations to the rest of your party.

Addons like these can be very useful for boxers - keeping track of the soulstones from all the warlocks, watching the priests' Psychic Scream cooldown, seeing how long Sunder Armor has left on the mob, before I take this big pull let me check how long it will be before Shaman resurrection or Druid battle rez is available, etc. All without having to look away from your main toon.

Just make sure you have the addon of your choice installed on all your toons and that you have enabled timer communication in the options. All these mods have it turned off by default.