3.3.3 is the current patch at the moment this is written. The damage reduction from a critical strike is capped at 33%, which equates to 1414,5 resilience (94.3*33/2.2) at level 80 . This reduces your crit damage taken by 33% (the max allowed). It's a soft cap because there is no limit on your ability to reduce another player's % chance to crit against you (other than they can't go below 0%). The cap is just on the damage reduction of the crit. )
Many believe that the current Resilience cap is 1230 (82*30/2), but that was the old Resilience cap before Patch 3.0.3
before 3.2.0 a player needed 82.0 resilience rating to get 1% resilience at level 80.
after.. 3.2.0 a player needed 94.3 resilience rating to get 1% resilience at level 80.
before 3.0.3 the maximum damage reduction to a critical strike from resilience was 30%.
after.. 3.0.3 the maximum damage reduction to a critical strike from resilience is 33%.
before 3.0.3 The damage reduction component of resilience was 2 times the critical strike chance reduction.
after 3.0.3 The damage reduction component of resilience is 2.2 times the critical strike chance reduction.
Old 82*30/2 = 1230
New 94,3*33/2.2 = 1414,5