Most of the domain names referring to MJ are owned by other parties. I'm not sure if the Estate should go after them, they don't generate that much traffic.
"The Michael Jackson Company" also owns a handful number of domains (52 pieces exactly) all redirecting to michaeljacksonlive.com. Some of them are:
Some official domains are owned by strategic partners, like:
Sony - michaeljackson.com
AEG - michaeljacksonexhibition.co.uk
Bravado - michaeljacksonmerch.com
Cirque Du Soleil - cirquemichaeljackson.com