small reminder of the cast...
from left to right (with my guesses):
Ana Lucia - ENTj
Sawyer - ISTp
Locke (same name as a philosopher for some reason - INTj?
Jack - I though ENFj before, but ILEntp's suggestion of ESTj (and ENTj) makes me less certain
Sun - INFj
Jin - stereotypically ISTj, but...
Plus Boone, Desmond (the sailor), the Others etc...(esp. Ben Linus)
EDIT: just found out from wikipedia that Desmond's full name is Desmond David Hume - there's something going on there!