Punk SMS: send spoofed text messages
You can get death threats for helping people fake caller ID, but obviously undeterred, a prankster in Norway created Punk SMS, a site that makes it a snap to send spoofed text messages to your friends (or enemies) that'll make it look like they're coming from another number (it's not like you couldn't do this before or anything, this is just makes it easier). Right now it's only for hoaxing your pals in Sweden and Norway, but even so we're never trusting another text message ever again (which isn't to say that we aren't dying for this to come to America).