This talent has potential use in PvE when using Rain of Fire or Hellfire to help keep mobs from moving too much while channeling the AOEs. It also has potential for use in PvP.
Patch 3.1.0 (2009-04-14): Re-designed: Increases the periodic damage done by your Immolate by 3/6%, and your Conflagrate has a 50/100% chance to daze the target for 5 sec.
Patch 3.0.2 (2008-10-14): Now a 2-point talent, down from 5.
Patch 2.1.0 (2007-05-22): The delay on the daze effect has been reduced.