Blackberries hurting your thumbs?

Article from the BBC about how Blackberry use could lead to serious problems. Except it's all speculative.

The thumb is not very flexible and repetitive use of it can lead to damage to the tendon on the outside of the thumb. -- Professor Alan Hedge

According to the article there aren't any known instances of much worse than sore thumbs. If you remember mashing the buttons for the Nintendo or Commodore 64 joystick, it's apparently a similar scare.

So I suppose the news is that if your thumbs hurt, stop doing whatever it is that makes them hurt. Also many top scientists believe that consuming a whole lot of blackberries gives you sticky fingers and stains them a purplish color.