Positive reinforcement - Put a cotton ball, marble, pom-pom, etc. in every time you catch your child being good. Do something special when it's full. This is exactly what I need instead of focusing on the bad.
"Technology Tickets". Each Sunday give the kids 10 tickets. Each ticket = 30 minutes of t.v., game system, computer, etc. Tickets can be used consecutively, but when they are out they are out for the week.