I understand only 400 people turned up - and some of them were counter-demonstrators.
Conservative:
Weasel Zippers: Illegal Alien Supporters Rally in Boston to Protest Arizona Gov. Jan Brewer...
America's Watchtower: Arizona immigration law protest in Boston? What a bust!
DaTechguy's Blog: The Boston city counsel belatedly learns how to count
Holycoast: Anti-AZ Protest Flops in Boston
Hot Air: Boston retreats on Arizona boycott
Liberal and socialist:
Boston Indymedia: Boston Protests For Immigrant Rights