About 80 for PS2. I don't sell them because... well, I'm weird.

I owned 50 before I owned the console (I owned 4 Wii games before owning a Wii).

OK I'll try:

PS1:

-CTR
-Spyro
-3 Xtreme
-Cool Boarders 3
-Jeremy McGraw
I have at least 15 more but I can't think of them.

Around 15-25

PS2:
-Shadow of the Colossus
-R&C
-R&C Deadlocked
-Jak & Daxter
-Jak 3
-Dark Cloud
-Tony Hawk's 3
-DDR SuperNova
-NHL 2006

At least 15 more
Around 20-30

PSP:

-Daxter
-Bounty Hounds
-Twisted Metal: Head On

since i have to much i wont write there names but i have over 70 ps1 games and over 20 ps2 games

 Wow, I'd say you're a hardcore gamer.

My Playstation games: (I was young, so some games in the list are bad)
Oddworld: Abe's Oddysee
Final Fantasy VIII
Final Fantasy IX
Spyro
Spyro 2: Getaway to Glimmer
Crash Bandicoot 3 Warped
Disneys The Emperors New Groove (-_-)
Tomb Raider II
Tomber Raider III
Tomb Raider IV
Tekken 2
Tekken 3
Celebrity Deathmatch
Harry Potter And The Chamber Of Secrets
Speed Freaks

Playstation 2:(The first half are my favourites)
Final Fantasy X
Final Fantasy XII
God Of War
God Of War II
Tekken 5
Dragon Quest VIII
Resident Evil 4

Enter The Matrix
The Matrix: Path Of Neo
James Bond Everything Or Nothing
Tony Hawk's Underground
Prince Of Persia Sands Of Time

So thats about 27 if I counted correctly.

 You skipped Jak II?  That was easily the best in the series.

I have about 36 PS1 games, including both LUNAR box sets. I lost the pendant on one of them though, because I carried it around. :`(

PS1: to many to list individually so i'll give dimensions 4 stacks 2 feet 8 inches tall (???)

PS2:  I'm to lazy to list them   (18)

PS3:  (8)

Copied mostly from my games list.  Apologies for spacing issues.  A - prefacing a game means I'm planning to sell it.  * means I don't have it any longer.

PS1

Games:      Order A/P/W/T Developer
Final Fantasy VII    2 Y/Y/Y/1 Squaresoft
Final Fantasy VIII    3 N/Y/Y/1 ""
-Final Fantasy IX    11 N/Y/Y/1 ""
Final Fantasy Tactics    12 N/Y/Y/3 ""
-Final Fantasy Origins    23 Y/Y/Y/1 ""
SaGa Frontier     25 Y/N/N/1 ""
SaGa Frontier II    14 N/Y/N/1 ""
Parasite Eve     24 Y/Y/N/2 ""
Parasite Eve II     19 Y/N/N/2 ""
Brave Fencer Musashiden    13 Y/Y/Y/2 ""
Xenogears     1 Y/Y/Y/1 ""
Chrono Cross     4 Y/Y/Y/1 ""
Legend of Mana     5 Y/Y/Y/2 ""
Dewprism     18 Y/Y/Y/2 ""
Vagrant Story     6 Y/Y/Y/2 ""
Castlevania: Symphony of the Night  20 Y/Y/Y/2 Konami
Suikoden     15 Y/Y/Y/1 ""
Vandal~Hearts     16 Y/Y/N/3 ""
-Metal Gear Solid    8 N/Y/Y/4 ""
Dragon Warrior VII    21 Y/Y/Y/1 Enix
Star Ocean: The Second Story   7 Y/Y/Y/2 ""
Lunar: Silver Star Story Complete  22 N/Y/Y/1 Game Arts
Lunar: Eternal Blue Complete   17 Y/Y/Y/1 ""
Harvest Moon: Back to Nature   10 Y/Y/Y/9 Natsume
-The Legend of Dragoon    9 N/Y/N/1 Sony

Total: 25 games
Appeal Rate: 18/25 (72%)
Play Rate: 23/25 (92%)
Win Rate: 19/25 (76%)

PS2

Games:      Order A/P/W/T Developer
Final Fantasy X     1 Y/Y/Y/1 Squenix
-Final Fantasy X-2    11 N/Y/Y/1 ""
-Final Fantasy XII    40 Y/Y/Y/2 ""
Kingdom Hearts     2 Y/Y/Y/2 ""
Kingdom Hearts II    33 Y/Y/Y/2 ""
-Front Mission 4    27 Y/N/N/3 ""
Star Ocean: Till the End of Time  13 Y/Y/N/2 ""
Radiata Stories     21 Y/Y/Y/2 ""
Dragon Quest VIII    25 Y/Y/Y/1 ""
Valkyrie Profile: Silmeria    36 Y/Y/N/2 ""
-Dawn of Mana     43 Y/N/N/2 ""
-Xenosaga Episode I: Der Wille zur Macht 5 Y/Y/Y/1 Namco
-Xenosaga Episode II: Jenesits von Gut und Böse 17 N/Y/N/1 ""
Xenosaga Episode III: Also Sprach Zarathustra 35 Y/Y/Y/1 ""
Katamari Damacy     15 Y/Y/Y/7 ""
We Love Katamari    22 Y/Y/Y/7 ""
Tales of Legendia    30 Y/Y/N/2 ""
Tales of the Abyss    37 Y/Y/N/2 ""
Suikoden III     3 Y/Y/N/1 Konami
Suikoden IV     16 Y/Y/Y/1 ""
Suikoden V     31 Y/Y/Y/1 ""
-Suikoden Tactics (Rhapsodia)   32 Y/Y/N/3 ""
Castlevania: Lament of Innocence  6 Y/Y/Y/4 ""
-Castlevania: Curse of Darkness   24 Y/Y/Y/2 ""
-Dark Cloud     8 N/Y/N/2 Sony
Dark Cloud 2     9 Y/Y/Y/2 ""
Rogue Galaxy     41 Y/Y/Y/2 ""
Arc the Lad: Twilight of the Spirits  26 Y/Y/N/3 ""
-Gran Turismo 4     18 Y/Y/N/8 ""
-Grand Theft Auto 3    10 Y/Y/N/m Rockstar
Grand Theft Auto: Vice City   12 Y/Y/Y/m ""
Grand Theft Auto: San Andreas   14 Y/Y/Y/m ""
Bully      39 Y/Y/N/m ""
Prince of Persia: The Sands of Time  19 Y/Y/Y/4 Ubisoft
-Prince of Persia: Warrior Within  20 Y/Y/N/4 ""
Prince of Persia: The Two Thrones  29 Y/Y/N/4 ""
Harvest Moon: Save the Homeland   7 Y/Y/N/9 Natsume
Harvest Moon: A Wonderful Life Special Edition 23 Y/Y/N/9 ""
Bumpy Trot (Steambot Chronicles)  34 Y/Y/N/m Atlus
Odin Sphere     42 Y/Y/N/2 ""
Okami      38 Y/Y/N/4 Capcom
-The Sims     28 Y/Y/N/9 Maxis
*Enter the Matrix    4 N/Y/N/4 Atari

Total: 43 games (42 still owned)
Appeal Rate: 39/43 (90.70%)
Play Rate: 41/43 (95.35%)
Win Rate: 20/43 (46.51%)

PSP

Games:                        Order    A/P/W/T    Developer
The Legend of Heroes: A Tear of Vermillion    4    Y/Y/N/1    BandaiNamco
The Legend of Heroes II: Prophecy of the    3    Y/Y/Y/1    ""
  Moonlight Witch
Legend of Heroes III: Song of the Ocean        9    Y/Y/N/1    ""
Me and My Katamari                5    Y/Y/Y/7    ""
Tales of Eternia (European version)        10    Y/Y/N/2    ""
Tales of the World: Radiant Mythology        14    Y/Y/Y/2    ""
Harvest Moon Boy & Girl (Japanese version)    12    Y/Y/Y/9    Natsume
Innocent Life: A Futuristic Harvest Moon    13    Y/Y/Y/9    ""
-Generation of Chaos                1    Y/Y/N/3    NIS
Prince of Persia: Revelations            2    Y/Y/N/4    Ubisoft
Valkyrie Profile: Lenneth            6    Y/Y/Y/2    Squenix
Grand Theft Auto: Vice City Stories        7    Y/Y/N/m    Rockstar
Sega Genesis Collection                8    Y/Y/Y/x    Sega
Gurumin: A Monstrous Adventure            11    Y/Y/Y/2    Mastiff
Castlevania Dracula X Chronicles        15    Y/Y/Y/1    Konami

Movies:
Final Fantasy VII - Advent Children        1    Movie    Squenix

Total: 15 Games, 1 Movie
Appeal Rate: 15/15 (100.00%)
Play Rate: 15/15 (100.00%)
Win Rate: 9/15 (60.00%)