In alphabetic order:

Balázs & Csaba - Programmed the game and maintain the elastomania.com
barbapappa - Lost Internal levels
bluu - Moposite logo
ciph - ex single level reviewer
DarMoeD - Translation help (Russian)
dz - Official Level pack rater, Mopolauta moderator
EML - WCup total points
GuyB - WCup4 team and country points updater
Epsilon - Translation help (Hebrew)
Hibernatus - Record lists generating program, anti-cheating programs
jcl - Translation help (Hungarian)
Jokke - Helped to convert Kinglist to new Moposite format, ex Replay section updater
Juish - Links updating
kombi - Translation help (Dutch)
MagnusB - Mopolauta moderator, translation help (Norwegian, English)
Luther - Replays section updater
MGen - Anti-cheating programs, Mopobattle results program
Mick - ex Links updater
milagros - Anti-cheating programs
mrickx - ex WR statistics updater
MUe - Elma CD stuff, animations, pictures, screenshot contest
partybear - WR statistics program, translation help (German)
psy - ex Official Level pack rater, LOM rater, Kuski gallery moderator
Radim - ex replay pack updater, translation help (Czech)
Rasu - Translation help (Swedish)
Sathy - Ideas, translation help (English), LOM stuff
skint0r - Updating Lgrs section, LOM rater, Kuski gallery moderator, Mopobattle organizer
skint0r - Web space provider
Sniper - Logo in px's old page
Spetzler - Translation help (Danish)
SveinR - Mopolauta moderator
Tapzu - WCup1, 2k and 3 team points
the man - Links updating
Tisk - Mopolauta moderator (in older Mopolauta), irc logs, WCup stuff
tura - Links page, PHP, SQL, PERL
Twipley - Translation help (Dutch)
Vaitork - Translation help (Spanish)
Viper_KillerGuy - PHP, SQL
zo3 - First funny (slesk) replay update

more?