As a dedicated business machine, it's been somewhat hard to take the PlayBook seriously. For one, up until very recently, the device didn't even have native email or contacts support, which for a long while made RIM's device the butt of many jokes.
Fortunately, RIM is slowly filling in the PlayBook's holes, continuing now with the official PlayBook Mini Keyboard. Doubling as both a case and keyboard, the device adds some pretty valuable functionality to the PlayBook's feature set, including (obviously) a physical keyboard but also touchpad gestures.
Communication between the keyboard and PlayBook is done over 128-bit encryption, which should satiate the fears of the security-minded.
The only really unsettling part about the keyboard is that, at $119, it's less than $100 cheaper than the 16GB PlayBook itself. A bit zany? I'd say so.