LibHealComm-4.0 is a library that keeps track of heals being cast by both the player and the people they are grouped with. It will estimate how much a heal will land for using talents,and auras as well as gear and provides data to other users using LibHealComm-4.0. There is a variety of ways to show data, anything from a simple bar that indicates how much healing is incoming on an unit to showing a graphical summary of what player is casting what heal, on who and how long it will take to land.
Thanks to xbeeps for his work on LibHealComm-3.0 as well as Gagorian (DrDamage) for being able to steal his data.
For tickets, http://www.wowace.com/addons/libhealcomm-4-0/tickets/
For discussion, http://forums.wowace.com/showthread.php?p=286168