As many of you raiding Sunwell Plateau know, the first boss Kalecgos will despawn after a wipe. This allows healers to soulstone/ankh and res the raid, significantly decreasing time wasted running back to the instance.
However, Kalecgos respawns quickly (approx 30 seconds) leaving only a very small window for the healers to res. One way to despawn Kalecgos is to simply have somebody run into Kalecgos' area and die, thus causing him to reset.
A better way however, is to use an Eye of Kilrogg. As soon as the healers are up, res a warlock, who then drinks enough to summon an eye. The healers go about ressing people until just before Kalecgos spawns, when they run out of the area and the warlock sends the eye in. Kalecgos will attack the eye and despawn, allowing you to res people quickly and easily.