Some months ago, I have tested the entire PAL library.
These are the ones that are VGA INCOMPATIBLE:
AeroWings 1
AeroWings 2 - Airstrike
Bangai-O
Caesars Palace 2000
Capcom vs. SNK
Deadly Skies
Disney's Dinosaur
ECW Anarchy Rulz
ECW Hardcore Revolution
Heavy Metal Geomatrix
Hidden & Dangerous
Iron Aces - High Speed WWII Aerial Combat
KISS Psycho Circus - The Nightmare Child
MTV Sports Skateboarding
PenPen
Psychic Force 2012
Railroad Tycoon 2
Resident Evil - Code: Veronica
Skies Of Arcadia
Snow Surfers
Soul Fighter
The Next Tetris
WWF Attitude
These games are VGA COMPATIBLE VIA BOOTDISC (Xploder):
Aqua GT
Army Men - Sarge's Heroes
Buggy Heat
Bust-A-Move 4
Cannon Spike
Conflict Zone
Dino Crisis (GLITCH: no videos)
Dragon's Blood
Evil Dead - Hail To The King
Evolution 1 - The World Of Sacred Device
Giant Killers
Gunbird 2
Hydro Thunder
Jimmy White's 2 - Cueball
JoJo's Bizarre Adventure (GLITCH: picture is squashed in the upper part of the screen)
Midway's Greatest Arcade Hits - Volume 1
NBA ShowTime - NBA On NBC
NFL Blitz 2000
Plasma Sword - Nightmare Of Bilstein (GLITCH: picture is squashed in the upper part of the screen)
Resident Evil 3 - Nemesis
Roadsters
Sega Worldwide Soccer 2000
SnoCross - Championship Racing
South Park - Chef's Luv Shack
Spawn - In The Demon's Hand
Sydney 2000
Tee Off
Tokyo Highway Challenge 1
Tom Clancy's Rainbow Six
ALL THE OTHER PAL GAMES are VGA COMPATIBLE out of the box, including these ones:
bleem!: Gran Turismo 2
bleem!: Metal Gear Solid
bleem!: Tekken 3
Sega Swirl (DreamOn #8 / DreamOn #18)
DreamKey 1.0 / 1.5 / 2.0 / 3.0