Just for a laugh I took the the online Myers-Briggs test as mentioned by DK. As a rule I dislike such tests as they tend to deal in absolutes and for so many answers I would prefer a 'sometimes' or seek clarification of a point.
Ah well I came out as a INTJ and just to prevent the Astrological bias I also read DK's INTP profile which as you might expect having three types in common I had some connection with, however the INTJ description is kind of spooky.
This self-confidence, sometimes mistaken for simple arrogance by the less decisive, is actually of a very specific rather than a general nature; its source lies in the specialized knowledge systems that most INTJs start building at an early age [...] INTJs are perfectionists, with a seemingly endless capacity for improving upon anything that takes their interest. [...] Whatever the outer circumstances, INTJs are ever perceiving inner pattern-forms and using real-world materials to operationalize them.So nothing like me then :-P