Here's an Associated Press article involving a Maryland woman charged with criminal e-mail flaming.
Rachel L. Riffee, a death penalty opponent, was charged with criminal harassment after she sent nasty e-mail messages to a pro-death penalty Web site. A judge said a few e-mail messages didn't amount to harassment. (The unfortunately-unnamed-Web-site in question was created by Fred Romano, whose sister was brutally raped and murdered. While you're at it, check out Prof. Eugene Volokh's recent post on incarceration and punishment.)