Revision 29th May 07
In appreciation - honourable mentions of some great  user-contributors to Poser's  continuing evolution into a terrific program.

Acadia -  for always sharing her  wealth of Poser related links and her helpfulness
AdoranaDE - dynamic hair.
Ajax - (EasyPose)
andi3d -  for all his great bones
Anton - who has not only been an excellent content provider over the years but has designed and finally given away for free his brilliant Apollo figure and all contents.  His support has been/is exceptional too.
Arduino - highly appreciated for providing the genital bits for the chaste Millenium and Unimesh figures
As Shanim/Siliphiel -
Bagginsbill - for sharing his Matmatic and taking shaders    to new levels
lesbentley- a great many  Poser tech contributions and ever helpful
B.L. Render (Bloodsong).  "Secrets of figure creation for Poser"  is an indispensable asset for those who wish to create content for Poser.
JeffH - Poser4: Solved the Poser code syntax that allows for Changing Geometry Dials to be applied to any part of a figure.
Baron Vlad Harkonnen (BVH)
Jim Burton - for lots of (especially low poly) freebies for many years now
Bushi - he did a lot of great development work and was always very helpful in these forums.
Capsces - Poser3: Among the earliest pioneers in transforming animals through what later would become Full Body morphs and for adding so much more to all the poser figures with her great morph sets!
Steve Cox -  pre 1999 creator of UV Mapper, the most widely used UV mapping app for Poser content allowing for advanced UV mapping prior to tools like Deep UV.
DeeCey  - for her "Practical Poser" books.
Chris Derochie - started The Forge/PoseAmation back in the late 90s and has been instrumental in a lot of the early Poser animation and is still actively doing BVH work.
Colm
Steve Cooper -(Kupa)
Cyllan - her landscape products (Terraformers series, Horizons, Weird Weather, Geoforge) are very innovative - always dependant on outside apps line Bryce and Vue to do landscaping, but with Cyllan's prducts we can do it right within Poser now.
Dimension3D
Dodger
Dr. Geep - for his unique classroom style who has  newbies grinning  while climbing that painful learning curve
colin g
Ian Grey was co-admin of the Poserforum with Willow DaNaan. This was back when Poserforum was the first and only forum available for poser users.
face_off - Poser5/6: Pioneered advancements in node based photorealistic Poser skin rendering and he has been so helpful in the forums.
Dan Farr - formerly of Zygote
Catharina Przezak/Harders -( digital woman)- Pre 2000: One of the first and earliest photo realistic figure texturists upon which other later artists based their work. Predates most texturists  and she always tried to share her knowledge in the forums.
Hellborn - was the first to make an anatomically correct genital hip for a female figure.  His WWG (Woman With Genitals) was the P3 Posette with his specialized hip hard welded into the mesh.
 Anthony Hernandez - 2002: employee of Curious Labs, gathered, compliled and released the CR2 guide from interal and community information.
DPHoadley  - for remapping Posette and Dork to take V3 textures.
hokusai
ISOP
JKeller - pre 1999 Created Jacketman. Earliest example of cr2 embedded clothing. Pre dates conforming clothes
kirwyn.- His/her dynamic hair solutions are innovative and a great asset to animators.
Kozaburo - (with Yamato) introduced the concept to Poser of realistic transmapped hair, eyelashes, etc to the community. Earliest designers of hand painted realistic hair textures with baked-in highlights, a lot of which are still available for free
 jack k - Poser Forum owner before it became Renderosity
 jaager - prolific morph'n stuff contributor- among which are anatomically correct  hip/genital
 Kim99 for his brilliant CR2Builder program, which is not only the best damn Poser file editor around, it's absolutely free.
 Lab 108
 Michael Lane - Poser4: Innovated first Global Illumination to Poser using Poser4 lights in a dome effect.
 Tim Laubauch - Pre 2000: Site Happy World Land was a huge resource for Posette photo based textures
 legume- originated the Poser forum on usenet and 2002: Starting the Magic Pink Pony & Mr. Fluffers anto-Poser hot 20 pardody.
 Levius - photo source for a lot of textures
LittleDragon
John Malis - for his Armor textures
Mapps - so generous with his great freebies, models and textures
Patrick Martin - of the Papa Sage Fame
Masa - innovative utilities such as PAE
Maveris
maxxxmodels - great helpfulness
maya - creator of free Maya Doll and lots of freebies
maz -  for his objaction mover program  This encryption/decription program was a breakthrough in allowing figure modifications to be distributed without infringing copyright.
Moebius
Nerd
nitrane
Ockham - for great python scripts automating a great many Poser functions- all for free
opera guy - enlightening discussions
Panko -  for weapons and skin textures
PhilC - tutorials and great add-ons like Wardrobe Wizard etc
Pitklad for NEAena, Neja, and Domus.
nruddock - for  invaluable Poser tech contributions.
Sams3D - generosity with superb freebies and tutes
SanctumArt (Michael Rak) for being a true innovator and master for sci-fi, both in Poser and abroad in other mediums. And one of the best modellers around anywhere; ever.
Steve Shanks- generous contributor of quality freebies
Schlabber...he is the posing genius and has helped pretty much everyone in their posing endeavors.
sharkey
Sixus1-  for getting 1 complete model out a week for 3 years for the CP freebie while doing other contract work and for having a hand in a lot of the content for Poser 7.
snowsultan - Standardized the design approach for color coded UV mapping templates based on color blocking seam-line polygons.
Stahlratte for GIRL 3, Wiktorija, and Valerie
SteffyZ - pioneer in hyper-realistic textures
stewer - one of the most informative and enlightening helpers
Stonemason - superb product innovation
svdl - quality free creations and always helpful
Sydd - who showed what could be accomplished with photo references for creating hyper-realist textures.
Symphony- Merilyn Ellison (D'Mentia) and Moyra (Ellusion) for their introduction of coplex layered texture/transmapping effects to Poser that changed forever the way Poser clothes were textured.
Don Tatro - created and shared the iconic Creepy the Clown
3dsk - Acclaimed photo reference store design catering to 3d artists. Most widely used photo reference site used in Poserdom.
Thorne - oldendays calendar faerie freebies, inspiration, beautiful faces and figures
Torino - Invented the first Eve.  He pioneered the Hip/Buttock/Thigh configuration, and the Inverted T chest with the breast in the
Collar groups- came up with the so-called "millenium"-style rigging of characters
Traveler - great contributor of quality freebies  and tutorials for using the morph magnets etc
Trekkiegrrrl - freebies galore
tromnek (Poser RPC scripts)
Virus - Admin for The Prop's Guild, one of Posers frst mega content sites. All content was free.
VK - I wouldn't be surprised if the Poser 7 dependent parameters are an evolution of his work with complex master/slave dial relationships.
Judith Ward for what she has done with bontanicals over all these many years.
Larry Weinberg - Inventor/ designer of Poser
Robert Whisenant was the one who really went in and made sense of all the ERC/JCM/etc.
willow - originator of the Poser Forum which became Renderosity
Wyrmmaster - for fathering what magnets could be used for with figures and clothes.
yamato -(with Kozaburo)  introduced the concept to Poser of realistic transmapped hair, eyelashes, etc to the community. Earliest designers of hand painted realistic hair textures with baked-in highlights. Some fantastic figures and innovative utilities,
Yarp - for free 3PDO which makes Poser file navigation so much easier.