From IMDB the cast:
Charlize Theron (Monster, The Italian Job)
Woody Harrelson (Natural Born Killers, Kingpin)
Ray Liotta (Goodfellas, Field of Dreams)
Ivana Milicevic (Casino Royale, Love Monkey-tv)
Michelle Rodriguez (Girlfight, Resident Evil)
Andre Benjamin (Four Brothers, Idlewild)
Jennifer Carpenter (in TV series, Dexter)
Chris Evans (Fantastic Four, Celluar)
Josh Jackson (Dawson's Creek-TV, The Might Ducks)
Channing Tatum (Step Up, Shes the Man)
Tzi Ma (who plays Governer Gary Locke-- He is the evil bad guy in 24!!)
Connie Nielsen (Gladiator, Mission to Mars)
Susan Sarandon (Dead man walking, Thelma and Louise)
I notice they had jackson, tatum, and evans. To draw in the younger female viewers
Some links to articles about the movie:
UK Observer:
Charlize now faces her own battle of Seattle | World | The Observer
Seattle Times:
The Seattle Times: Movies: Lights! Camera! Tear gas! WTO riots to be a movie
The Seattle Times: Local News: Riot act: Movie re-creating WTO chaos
Seattle PI:
WTO 'Battle in Seattle' being filmed here this weekend
Hollywood creates its own 'Battle in Seattle'
Vancouver Sun:
Battle in Seattle now includes some snow scenes