I entered this blog's name and discovered that I'm classified as a Doer (see not-too-accurate illustration of Doer, from Typealyzer, at left). BW says that Bill Marriott is a Doer, as well, based on his blog. Here's the definition of Doer, from Typealyzer. What do you think?
The active and playful type. They are especially attuned to people and things around them and often full of energy, talking, joking and engaging in physical out-door activities.
The Doers are happiest with action-filled work which craves their full attention and focus. They might be very impulsive and more keen on starting something new than following it through. They might have a problem with sitting still or remaining inactive for any period of time.