TAAATS after some initial problems works quite well. Must remember there is a substantial ATC involvement in its development, which is ongoing all the time.
Basically its the Eurocat 2000 with Oz modifications. I think Sweden have the same system. Fiji use some of it as well.
USA decided to go for a some other system. Don't know if it is any good.
Go to
http://www.airservicesaustralia.com/...banecentre.asp
for a look at Oz ATC