Thanks to Console-News for this information.
0001 - Ridge_Racers_JAP_PSP-PARADOX
0002 - Vampire_Chronicle_The_Chaos_Tower_JAP_PSP-PARADOX
0003 - Wipeout_Pure_USA_PSP-PARADOX
0004 - Metrowerks_CodeWarrior_for_PSP-iND
0005 - Twisted.Metal.Head.On.USA.PSP-Dynarox
0006 - Lumines_USA_PSP-Dynarox
0007 - Gretzky_NHL_2k5_USA_PSP-Dynarox
0008 - Smart_Bomb_USA_PSP-Dynarox
0009 - Ridge_Racer_USA_PSP-Dynarox
0010 - Need_For_Speed_Underground_Rivals_JAP_PSP-Dynarox
0011 - ATV_Offroad_Fury_USA_PSP-NONEEDPDX
0012 - Dynasty_warriors_USA_PSP-NONEEDPDX
0013 - NBA_2K5_USA_PSP-NONEEDPDX
0014 - Puzzle_Bobble_JAP_PSP-DEV
0015 - Metal_Gear_AciD_JAP_PSP-DEV
0016 - Hot_Shots_Golf_Open_Tee_USA_PSP-NONEEDPDX
0017 - World_Tour_Soccer_USA_PSP-iND
0018 - World.Tour.Soccer.USA.PSP-PGS
0019 - Tiger_Wood_PGA_Tour_USA_PSP-NONEEDPDX
0020 - Need_For_Speed_Underground_Rivals_USA_PSP-DEV
0021 - Dynasty_Warriors_JAP_PSP-DMU
0022 - Untold_legends_USA-PsP-DEV
0023 - Mina_No_Golf_JAP_PSP-DEV
0024 - Tony_Hawks_Underground_2_Remix_USA_PSP-NONEEDPDX
0025 - Lumines_JAP_PSP-PROJECTG
0026 - Ape.Escape.Onth.The.Loose.USA.PSP-FCC
0027 - Ape_Escape_On_The_Loose_USA_PSP-DMU
0028 - MERCURY_USA_PSP-NONEEDPDX
0029 - MLB_USA_PSP-NONEEDPDX
0030 - NAMCO_MUSEUM_JAP_PSP-NONEEDPDX
0031 - NFL_STREET_2_UNLEASHED_USA_PSP-NONEEDPDX
0032 - WORD_PUZZLE_MOJIPITTAN_JAP_PSP-NONEEDPDX
0033 - WORLD_TOUR_SOCCER_USA_PSP-NONEEDPDX
0034 - Soukyuu_no_Fafner_JAP-PSP
0035 - Spiderman.2.USA.PSP-PGS
0036 - Minna_no_Golf_Portable_Coca-Cola_Special_Edition_JPN_PSP-Caravan
0037 - Tales_of_Eternia_JPN_PSP-Caravan
0038 - NBA_Street_Showdown_USA_PSP-LIGHTFORCE
0039 - SwaPloit_1.5_PSP-DEV
0040 - Metal_Gear_Acid_USA_PSP-LIGHTFORCE
0041 - Kollon_JAP_PSP-DUO
0042 - Shutoku_Battle_Zone_of_Control_JAP_PSP-DMU
0043 - Puyo_Puyo_Fever_JAP-PSP
0044 - Rengoku.The.Tower.of.Purgatory.USA.PSP-TEMP
0045 - Rengoku-The_Tower_of_Purgatory_USA_PSP-LIGHTFORCE (dupe.Temp)
0046 - MVP_Baseball_USA_PSP-YERSiNiA
0047 - FIFA_Soccer_USA_PSP-YERSiNiA
0048 - Piposaru_Academia_Dossari_Sarugee_Daizenshu_JAP_PSP-DMU
0049 - Densha_De_Go_JAP_PSP-LIGHTFORCE
0050 - Bleach_JAP_PSP-DEV
0051 - Mahjong_Fight_Club_JPN_PSP-Caravan
0052 - Darkstalkers_Chronicle_The_Chaos_Tower_USA_PSP-SbN
0053 - Coded_Arms_JAP_PSP-DMU
0054 - Need_For_Speed_Underground_Rivals_JAP_PSP_INTERNAL_RIP-pSyPSP
0055 - Tiger_Woods_PGA_Tour_USA_PSP_INTERNAL_RIP-pSyPSP
0056 - Sangokushi_V_JAP_PSP-DMU
0057 - Wipeout_Pure_JAP_PSP-DEV
0058 - Space_Invaders_Pocket_JAP_PSP-CoreCZ
0059 - MidnightClub3.Dub.Edition.USA.PSP-YERSiNiA
0060 - Armored_Core_FF_JAP_PSP-DEV
0061 - The_Legend_of_Heroes_A_Tear_of_Vermilion_JAP_PSP-PLAY
0062 - Generation_of_Chaos_IV_Another_Side_JAP_PSP-PLAY
0063 - Rengoku_The_Tower_of_Purgatory_JAP_PSP-PLAY
0064 - Popolocrois_Story_Adventure_of_Prince_Pietro_JAP_PSP-PLAY
0065 - MVP_Baseball_USA_PSP_INTERNAL_RIP-pSyPSP
0066 - Tony_Hawks_Underground_2_Remix_USA_PSP_INTERNAL_RIP-pSyPSP
0067 - Puyo_Puyo_Fever_JAP_PSP-PLAY
0068 - The_Legend_of_Heroes_White_Witch_JAP_PSP-PLAY
0069 - Dead_To_Right_Reckoning_USA_PSP-YERSiNiA
0070 - Lumines.USA.Working.PSP-PaL
0071 - Mercury.USA.Working-PaL
0072 - Sarugetchu_P_JPN_PSP-Caravan
0073 - Coded.Arms.PSPRIP-ENERGiZER
0074 - Adventure_Player_JAP_PSP-PLAY
0075 - Dokodemo_Issyo_JAP_PSP-PLAY
EDIT: I updated the list. All OFFICIAL releases have been added in and numbered. List will be updated regularly. - Chouonsoku
EDIT: Added releases 0074 - 0075.