IBM 104-key TrackPoint Keyboard

Pros: Has cured my tendinitis
Cons: Expensive, but worth it

During my first week on the job a few years ago, I courageously asked my new boss for a new keyboard for my workstation. My reasons were clear: The IBM TrackPoint keyboard is cheaper than a worker's comp claim for the tendinitis in my right wrist that is...

Pros: Your hands stay on the keyboard!
Cons: Expensive! Only two mouse buttons

I'm one of those people who like to use the keyboard for everything... alt-tab to switch between applications, alt, then the arrow keys to select menu items, tab to move between boxes in forms, etc. Hence, I rarely use the mouse, if ever. Web surfing it...