I find this really intersting too Chaosrob, I don't quite understand all of it, and would love to read more on it when I have the time, I find Carl Jung to be a fasincating mind! I've taken this test several times since my first psychology course in high school where we took it and I always get ENFP the Journalist or ENFJ the Teacher

I'll post my results...I got the ENFP this time, I'm going to post the one from the site you gave and the other discription I found on wikipedia

Similar Minds site description:
Outgoing, social, disorganized, easily talked into doing silly things, spontaneous, wild and crazy, acts without thinking, good at getting people to have fun, pleasure seeking, irresponsible, physically affectionate, risk taker, thrill seeker, likely to have or want a tattoo, adventurous, unprepared, attention seeking, hyperactive, irrational, loves crowds, rule breaker, prone to losing things, seductive, easily distracted, open, revealing, comfortable in unfamiliar situations, attracted to strange things, non punctual, likes to stand out, likes to try new things, fun seeker, unconventional, energetic, impulsive, empathetic, dangerous, loving, attachment prone, prone to fantasy

And here is the wikipedia description:
ENFPs are initiators of change, keenly perceptive of possibilities. They energize and stimulate others through their contagious enthusiasm. They prefer the start-up phase of a project or relationship, and are tireless in the pursuit of new-found interests. ENFPs are able to anticipate the needs of others and to offer them needed help and appreciation. They bring zest, joy, liveliness, and fun to all aspects of their lives. They are at their best in situations that are fluid and changing, and that allow them to express their creativity and use their charisma. They tend to idealize people, and can be disappointed when reality fails to fulfill their expectations. They are easily frustrated if a project requires a great deal of follow-up or attention to detail