My wife's primary compliant is that I've got anger issues. To be upfront, I've never struck or threatened my wife or kid. What she describes as "anger" is my yelling out of frustration if I broke something while working on a project or being short and curt with her. I acknowledge my short comings and have made a concerted effort to change my behavior since she has threatened to divorce me on Easter.
What specifically are you doing that is different?
What about other areas of improvement? What else are you 'working on'?