Is the BlackBerry a terrorists choice of communication tool?
No. The BES-user is working in a company. Any mail he sends is not only traceable, but also stored and backed up. As for BIS, that is in RIM’s control: so access is easier for government agencies. The smarter terrorist would go to a cybercafe, and use a Gmail or Yahoo mail account. He’d simply read and save mail in draft mode without sending mail. So there’s nothing to intercept. Then there’s fileshare: sites like YouSendIt, where he can keep encrypted files – leaving almost no trace, unlike with a BES mail.