Thanks so much to everyone who responded so far, let's keep this going!

Here's a statistical analysis based on the 17 responses so far, compared to the general population (I got those statistics here: http://www.theanconas.com/MBTI/mfstats.htm)...

Borderline Population..................General Population:
I (Introverted) - 64.7% (11)........50.7%
E (Extroverted) - 35.5% (6).........49.3%

S (Sensing) - 41.2% (7)..............73.3%
N (Intuition) - 58.8% (10)...........20.7%

F (Feeling) - 76.5% (13)..............59.8%..(F=75.5%...M=56.5%
T (Thinking) - 23.5% (4).............40.2%........45.5%.......43.5%)

J (Judging) - 76.5% (13).............54.1%
P (Perceiving) - 23.3% (4)...........45.9%

So borderlines seem to be more introverted than most, which could also be biased due to this being an internet poll and it may attract more introverts in general. Also we are more intuitive, and rely more on feeling. However, most borderline patients are female, and the ratio of feeling to thinking is actually just about the same as the female population. I imagine the difference is not just that we rely more on feeling, but that the feelings are much stronger, more sudden, and more intense. And lastly, borderlines are more likely to use judging rather than perception. Of course, this is only a small poll so we will see how things change as we get more results!

Here are some links that help explain each category...

Extraversion vs. Introversion:
http://changingminds.org/explanation..._introvert.htm
Sensing vs. Intuiting:
http://changingminds.org/explanation..._intuiting.htm
Thinking vs. Feeling:
http://changingminds.org/explanation...ng_feeling.htm
Judging vs. Perceiving:
http://changingminds.org/explanation...perceiving.htm