The september issue of Wired mag lists the top five special effects workshops (in no particular order). Among them is Weta Digital. The others are: Digital Domain, ILM, Rhythm and Hues, and Sony Pictures Imageworks.
The caption for Weta reads:
PAST WORK: The Lord of the Rings: The Fellowship of the Ring, one Oscar, one Bafta. BRAGGING RIGHTS: Shoo-in for three consecutive Oscar nominations, thanks to the LOTR trilogy. TECH CRED: AI-powered software that can choreograph complex battle sequences in just hours. IN THE QUEUE: Two more LOTR epics. I WAS BLOWN AWAY: “When I saw 70,000 individually animated soldiers onscreen at one time.” – Peter Jackson, cofounder and director