A bunch of us at work took the Meyers-Briggs test for fun at work. I came out as usual: INFP, though only the I is strong, at 60%. All the rest fell at about 11%.
It's especially bad with the E/I split. I'm such a sucker for a conversation, and if there's one going on, I'll want to switch to E mode and start talking to everyone. This makes for a difficult time at work, because people will chat, and I'll want to take part. This is why most of the time, I'm listening to music in my cube with my headphones on. I've got to drown out distractions, to focus. Well, alright, part of that can be ADD, but I'm not sure I really believe that 'disease' exists. Maybe there is a condition where some people's brains work differently, and they're more prone to jump around, but instead of trying to make them 'normal', I'd be inclined to try and find an activity that plays to their uniqueness and skills and let them learn how to turn their brain to something enjoyable and profitable.
Normalcy is overrated.
But anyway, I'm the lone INFP in the office, surrounded by ENTJ's and ISTJ's. Career guides say I'm good in information design, teaching, psychology, and writing. w00t!
As an aside, speaking of ADD, ISTJs and computer programmers, heres a joke for you:
How do you tell the difference between an extroverted programmer and an introverted programmer?
An introverted programmer will look at his shoes while he talks to you. An extroverted programmer will look at your shoes.

FYI -- The League of INFP is recruiting.