While fighting a spellcaster, Bash them to interrupt their spell, then Maul once and walk back. As the enemy comes out of the stun and starts to cast another spell you proceed to Feral Charge them, which locks their spells out.
Unlike Entangling Roots or Frost Nova, Feral Charge is a physical effect, meaning it cannot be dispelled by priests or paladins. A character with Blessing of Freedom is still immune to the root effect.
Feral Charge in its entirety is reflected by mobs with magic reflection and grounded by shaman Grounding Totems.
Can be used when airborne as an effective countermeasure to knockback attacks or to prevent falling damage. Affectionately known as "Rawrbomb" (especially when combined with Swift Flight Form in World PvP).
In Karazhan against Shade of Aran, Feral Charge will interrupt Aran's spells, giving the raid one more viable interrupt to the pool.
Feral Charge can be extremely effective in reducing damage taken (all types due to range limits, but esp. melee) while racing across the map. A druid flagrunner in Warsong Gulch will often leapfrog between the people attempting to stop her!
Using Feral Charge (Cat) triggers the 15s cooldown for Feral Charge (Bear)
Patch 3.0.2 (2008-10-14): Is now a 21-point talent, up from being a 11-point talent. Can now be used in Cat form.
Patch 2.3.0 (2007-11-13): It is now possible for the interrupt and root effects from this ability to be resisted separately.
Patch 1.9.1 (2006-01-10): Should no longer desync characters from the server when charging from land to water.
Patch 1.6.0 (2005-07-12): Targets that are immune to immobilizing effects will no longer be affected by Feral Charge's immobilizing effect. The interrupt will still affect the target.
Edit
Patch 3.0.2 (2008-10-14): Is now a 21-point talent, up from being a 11-point talent. Can now be used in Cat form. 
Patch 2.3.0 (2007-11-13): It is now possible for the interrupt and root effects from this ability to be resisted separately. 
