This personality analysis seems pretty accurate to me. I'm an "introverted thinker with auxiliary extraverted sensing". A scientist, basically.

The potential ways in which an ISTP can irritate others include:

focusing too much on the current task at the expense of longer term or interpersonal issues

not seeing the wood for the trees

not completing a task before moving on to the next one

not communicating his/her understanding of the situation

taking shortcuts

seeming to flit from one thing to another

Yep, that's me, all right. [Link nicked from Tom.]