I did it for the DS so it's only fair. 
1 UMD (1.8GB max double layered)
-Adventure Player (From Software) 200MB
-Ape Academy (SCEA/SCEI) 100MB
-Ape Escape: On the Loose (SCEA/SCEI) 760MB
-Archer Maclean's Mercury (Ignition Entertainment/Awesome Studios) 225MB
-Armored Core: Formula Front (From Software) 400MB
-ATV Offroad Fury - Blazin' Trails (SCEA/Climax Studios) 375MB
-Bleach: Heat the Soul (SCEI/Eighting) 250MB
-Coded Arms (Konami) 120MB
-DarkStlakers Chronicle: The Chaos Tower (Capcom) 435MB
-Dead to Rights: Reckoning (Namco) 105MB
-Dokodemo Issyo (SCEI) 120MB
-Dynasty Warriors (KOEI) 525MB
-Eiyuu Densetsu Gagharv Trilogy: Shiroki Majo (Bandai/Nihon Falcom) 760MB
-FIFA Soccer (Electronic Arts) 550MB
-Generation of Chaos (NIS/Idea Factory) 420MB
-Glorace: Phantastic Carnival (SCEK) 60MB
-Gretzky NHL (SCEA/989 Sports/Page 44 Studios) 75MB
-Hot Shots Golf: Open Tee (SCEA/SCEI/Clap Hanz) 285MB
-Intelligent License (Now Production) 96MB
-Jissen pachislot: Hokuto no Ken Portable (SEGA) 160MB
-Kollon (Cyberfront) 40MB
-Kotoba no Puzzle: Mojipittan Daijiten (Namco) 60MB
-Legend of Heroes (Bandai/Nihon Falcom) 680MB
-Lumines (Ubisoft/Bandai/Q Entertainment) 150MB
-Mahjong Fight Club (Konami) 140MB
-Metal Gear AC!D (Konami) 80MB
-Midnight Club 3: DUB Edition (Rockstar Games) 920MB
-Minna no Golf Portable: Coca-Cola Special Edition (SCEI/Clap Hanz) 300MB
-MLB (SCEA/989 Sports) 555MB
-Mobile Train Simulator & Densha de Go (Ongakukan/Taito) 420MB
-MVP Baseball (Electronic Arts) 570MB
-Namco Museum (Namco) 90MB
-Network Utility Disc (SCEK) 15MB
-NBA (SCEA/989 Sports) 75MB
-NBA Street Showdown (Electronic Arts) 140MB
-Need for Speed: Underground Rivals (Electronic Arts) 210MB
-NFL Street 2 Unleashed (Electronic Arts) 510MB
-Popolo Crois (Agetec/SCEI) 660MB
-Puyo Puyo Fever (SEGA) 80MB
-Puzzle Bobble Pocket (Taito) 20MB
-Rengoku: The Tower of Purgatory (Konami/Hudson) 150MB
-Ridge Racer (Namco) 525MB
-San Goku Shi V (KOEI) 160MB
-Shutokou Battle: Zone of Control (Genki) 320MB
-Smartbomb (Eidos/Core Design) 75MB
-Soukyuu no Fafner: Dead Aggressor (Bandai/XEBEC) 300MB
-Space Invaders Evolution (Rising Star/Taito) 50MB
-Spider-Man 2 (Activision/Vicarious Visions) 520MB
-Tales of Eternia (Namco/Tales Studio) 660MB
-Tiger Woods PGA Tour (Electronic Arts) 450MB
-Tony Hawk's Underground 2 Remix (Activision/Shaba Games) 270MB
-Twisted Metal: Head On (SCEA/Incog Inc Entertainment) 300MB
-Untold Legends: Brotherhood of the Blade (Sony Online Entertainment) 80MB
-WipEout Pure (SCEA/SCEE) 150MB
-World Tour Soccer (SCEA/SCEE) 240MB
...some stuff surprisingly smaller than I thought. And given only one game so far is above 900MB, I wonder of SCEI's pressing single layer UMDs?
1 UMD (1.8GB max double layered)
-Adventure Player (From Software) 200MB
-Ape Academy (SCEA/SCEI) 100MB
-Ape Escape: On the Loose (SCEA/SCEI) 760MB
-Archer Maclean's Mercury (Ignition Entertainment/Awesome Studios) 225MB
-Armored Core: Formula Front (From Software) 400MB
-ATV Offroad Fury - Blazin' Trails (SCEA/Climax Studios) 375MB
-Bleach: Heat the Soul (SCEI/Eighting) 250MB
-Coded Arms (Konami) 120MB
-DarkStlakers Chronicle: The Chaos Tower (Capcom) 435MB
-Dead to Rights: Reckoning (Namco) 105MB
-Dokodemo Issyo (SCEI) 120MB
-Dynasty Warriors (KOEI) 525MB
-Eiyuu Densetsu Gagharv Trilogy: Shiroki Majo (Bandai/Nihon Falcom) 760MB
-FIFA Soccer (Electronic Arts) 550MB
-Generation of Chaos (NIS/Idea Factory) 420MB
-Glorace: Phantastic Carnival (SCEK) 60MB
-Gretzky NHL (SCEA/989 Sports/Page 44 Studios) 75MB
-Hot Shots Golf: Open Tee (SCEA/SCEI/Clap Hanz) 285MB
-Intelligent License (Now Production) 96MB
-Jissen pachislot: Hokuto no Ken Portable (SEGA) 160MB
-Kollon (Cyberfront) 40MB
-Kotoba no Puzzle: Mojipittan Daijiten (Namco) 60MB
-Legend of Heroes (Bandai/Nihon Falcom) 680MB
-Lumines (Ubisoft/Bandai/Q Entertainment) 150MB
-Mahjong Fight Club (Konami) 140MB
-Metal Gear AC!D (Konami) 80MB
-Midnight Club 3: DUB Edition (Rockstar Games) 920MB
-Minna no Golf Portable: Coca-Cola Special Edition (SCEI/Clap Hanz) 300MB
-MLB (SCEA/989 Sports) 555MB
-Mobile Train Simulator & Densha de Go (Ongakukan/Taito) 420MB
-MVP Baseball (Electronic Arts) 570MB
-Namco Museum (Namco) 90MB
-Network Utility Disc (SCEK) 15MB
-NBA (SCEA/989 Sports) 75MB
-NBA Street Showdown (Electronic Arts) 140MB
-Need for Speed: Underground Rivals (Electronic Arts) 210MB
-NFL Street 2 Unleashed (Electronic Arts) 510MB
-Popolo Crois (Agetec/SCEI) 660MB
-Puyo Puyo Fever (SEGA) 80MB
-Puzzle Bobble Pocket (Taito) 20MB
-Rengoku: The Tower of Purgatory (Konami/Hudson) 150MB
-Ridge Racer (Namco) 525MB
-San Goku Shi V (KOEI) 160MB
-Shutokou Battle: Zone of Control (Genki) 320MB
-Smartbomb (Eidos/Core Design) 75MB
-Soukyuu no Fafner: Dead Aggressor (Bandai/XEBEC) 300MB
-Space Invaders Evolution (Rising Star/Taito) 50MB
-Spider-Man 2 (Activision/Vicarious Visions) 520MB
-Tales of Eternia (Namco/Tales Studio) 660MB
-Tiger Woods PGA Tour (Electronic Arts) 450MB
-Tony Hawk's Underground 2 Remix (Activision/Shaba Games) 270MB
-Twisted Metal: Head On (SCEA/Incog Inc Entertainment) 300MB
-Untold Legends: Brotherhood of the Blade (Sony Online Entertainment) 80MB
-WipEout Pure (SCEA/SCEE) 150MB
-World Tour Soccer (SCEA/SCEE) 240MB
...some stuff surprisingly smaller than I thought. And given only one game so far is above 900MB, I wonder of SCEI's pressing single layer UMDs?