Two additional sponsors, Motorola and On2.com, have been added to the 2000 Sundance Film Festival in Park City, Utah; fest kicked off Thursday and runs till Jan. 30.This marks the third year in a row for wireless industry giant Motorola’s participation as a festival sponsor. Motorola will host the Monday premiere party for Alan Rudolph’s new film “Trixie,” starring Emily Watson and Nick Nolte. Also, along with Ipix, the company will co-host CAA’s Tuesday party. New to Sundance this year is On2.com, an Internet content delivery network. As a fest sponsor, On2 will have access to Sundance premieres and events, gathering content such as celebrity interviews and behind-the-scenes coverage for broadcast on On2Movies, the network’s first Web channel.