Listed in order of "appearance":

Dries Buytaert <dries@drop.org>
  - project architect

Jeroen Bensch <jeroen@drop.org>
  - themes and documentation

Steven Wittens <unconed@drop.org>
  - themes and images

Kjartan Mannes <natrak@drop.org>
  - hosting, hardware, bandwidth

Michael O'Henly <michael@tenzo.com>
  - documentation improvements

David Norman <norny@yahoo.com>
  - code improvements