In 2003 the best team in the NRL won the premiership and that is the Penrith Panthers :D (They will also win the 2010 premiership)
They have won the NRL premiership twice as of 2010.
St. George Illawarra won the 2010 Premiership 32-8 against the Sydney Roosters. It was the first time St George has won the premiership as a joined team.
In 1998, the Brisbane Broncos won the NRL premiership.
The Warriors have never won the NRL. They won the minor premiership in 2002.
Melbourne Storm beat the Dragons to win the premiership
Manly Sea Eagles
The 2006 NRL Grand Final won by the Brisbane Broncos over the Melbourne Storm