ddee,
I am pleased you find Jungian typology useful
Many people do not know about it but its huge, bigger than horroscopes.
It's not 100% accurate but it's not bad hey.
I first became aware of it during my university studies in Human Resource Management. It is very relevant for organisational team development when placing the right people together to gain maximum productivity.
It's also a fantastic tool to use in gaining insight into other people’s preferences and therefore enhancing personal relationships.
Here’s a link to another site with loads of information, it's a Russian socionics site which is a little bit different to MBTI but I'm sure you'll find a lot of information.
http://www.socionics.com/
I am an INTJ, (1% of the population) before I learnt about Jungian typology I felt like an alien living on the wrong planet. Studying other type characteristics has helped me so much in my day to day life.
On that link there is a VI link click on that, down the bottom another link says, "test you VI skills. VI means visual identification. I have become pretty good at it. People face, posture and gait are a dead give away to their type. The Russians have even developed voice recognition to identify type.
You know Jung used to cure Schizophrenia and Bi Polar with out meds. A very intelligent man.
Do type ESFP into google and search, you'll be amazed how much info is out there for you type. Even forums for ESFP's exist.
When you know more about this stuff you'll become very vary of INTJ's.
If you have any other questions I might be able to help.
Good Luck with it.
PS All my Aries freinds are constantly injuring their heads. Bloody Rams. LOL.