[BerserkerTails]

Brilliant picture. I've listed as many characters/games as I can, from left to right:

-Myst (Ship under logo)
-Duke Nukem and Serious Sam (Having beers)
-Main character from Syberia (Winding the clockwork mammoth)
-The poster is of Agent 47 from Hitman
-Sam and Max (Costumes)
-Max Payne and Niobe from Enter the Matrix (Having a bullet time showdown)
-Jade, Pey'j and what appears to be a pig from Duke Nukem 3d.
-Lemmings and The Humans (Both the same type of puzzle game)
-I believe the big cat is from Ringworld...
-Underneath is Solid Snake along with those soldier guys from those Top Down real time strategy games (Can't remember the name)
-Bomberman (Don't know the dwarf)
-Manny and the guy from the cover of Dungeon Keeper
-The guy from Painkiller shooting Kain, Bloodrayne, Sarge (From Army Men) and a bad guy from Painkiller
-Looks like a Swoop Bike form Star Wars
-Maybe a Zurg feeding the bird?
-Cloud, Aeris and Sephiroth
-Lex Luthor watering Kryptonite?!?
-Master Chief crashing a Warthog into another vehicle.
-Abe from Oddworld riding a mech from Mechassault, talking to Twinbee from Little Big Adventure
-Gordon Freeman
-Ben kicking the dude from GTA: Vice City
-Larry being fanned by Princess Daphne (Dargon's Lair), Lara Croft, the girl from No one Lives forever, and a couple other girls.
-A Cthulhu monster
-Baba Yaga, an Alien (X-Com UFO Defense?), Purple Tentacle, LeChuck
American McGee's Alice eating Pac-Man along with Pyramid Head (Silent Hill) and the bad guy from Eternal Darkness. Looks like Thief from the "Thief" games there too.
-Earthworm Jim with a sandworm head (From Dune maybe), and a Worm from the "Worms" games
-I can only recognize Mega Man and the red guy from the robot fight, though I can't remember the two games he was in.
-Decker from Blade Runner analyzing a Clone Trooper from Star Wars
-A human in a cargo loader holding apart an Alien and Predator.
-The guy from Quake 3 with a flag
-The main character from StarCraft Ghost, obviously disappointed because her game was cancelled
-Simon the Scorceror being followed by Rincewind's chest from Discworld.
-Roger Wilco cleaning up a mess, including what looks to be an Orc from Warcraft.
-Touche, the fifth Muskateer, on fire?
-The guy from Quake killing the final boss
-The main character of MDK hanging from the final boss of Quake
-Raziel (Legacy of Kain) talking with Darth Malak (Knights of the Old Republic)
-Someone scolding George and Nico (Who have just broken a sword... Get it?)
-Out of the bouncing heads I can recognize Rayman, Scorpion, the flaming heads from Doom and Doom 3, and is that Murray as well?
-Prince of Persia, in some spikes as usual
-Looks like Kratos (God of War) with the rat?
-The Cyberdemon from Doom
-And finally, in their cage, Lester and the "buddy" alien from "Another World/Out of this Worl"

Still lots of gaps, but all of that was without looking up anything... God, I need to play lees video games.