Have a BlackBerry? Who are we kidding, who doesn't right? Anyway, do you Twitter more than you would admit in public? If you answered "Yes" to both questions, QSMS is a new piece of software (free I might add) that allows you apply a shortcut to the letter "Q" to send a text message similar to how "C" is a shortcut for composing an email message. You can download the software here.
As with the compose shortcut (and any shortcut for that matter), the "Dial from home screen" option must be disabled in the phone options.