Feel free to add the decent levels you've come across and plug your own ones,natch.
The Best Levels from Around The Planet Arcade/Puzzle Platforming
World of Colour! - geosautus (currently modded)
MIRRORS EDGE - EVOLUTION7354
EarthMusic - ...EarthMusic
Garden 1.1 - geosautus
Platforming Piers -Cstrfrk ***
Tick Tock Clock 2.0.1 (Episode 1) - TOBSn08
Downtown Tutorial - Treas
The Happiness-Factory!=) - TOBSno8
?????? A C T ??????? - Ryukunda
Pixalation 1.0 - JackIsBack999 ***
Pixalation 2.0 - JackIsBacl999
IGUNIS - natuneko4
Anti-color - ZX497
Jade! - Jaeyden
H.A.T.E. - Voltiare
Ruins of The Roller - o-tera
EarthMusic&Rust - EarthMusic
Maxed Out - Qugz (anybody into the creation side should check out the ideas here!)
Simplexity - Rayvolution
Anti-Color - ZX49
Little Amazon Delta - Checkvalve
MassiveTinyRace Act1: The Attic
MassiveTinyRace Act2: The Bedroom (both really good timetrial levels)
NEO-RETRO PLATFORMER - Stik
Little Big Donkey Kong - anamasa
Adventure/Story PlatformingThe Azure Palace - gevurah22 ***
Invasion! - Jaeyden
Mad Mansion - geosautus ***
ICO (Finished version) - Mushroom Samba
Jail Break - Link_AJ
Escape From Alacatraz - fords30
Little Big Colossus .V2 - Danielsan88
LittleBig Train Heist - dfyb
The Jade Fortress - Jaeyden
Into the Ocean of Madness - chubigans
TheDomain - DrPacifist
Pirate Adventure - swav331
Sackhouette-Forest King's Request - Luckett_X
Sackhouette 2-SkyGoose's Dilemma - Luckett_X
CastleQuest - Skauskallen
Adventure of Sack Knight - Tower of Gilgamesh - Reinheart
CALL OF CTHULHU: The Horror In the Deeps - FrikyJack
God of War - Demon Skull - geosautus
??3 japanese symbols??? - Azisand
Temple of Elements - Tankboi
The Treasure Hunter - Kamashii
Little Dead Space - Darkness Bear
Razhotep's Tomb - aer0blue
Space station 42 - Santana03 (this is just mad,be warned,i felt sick after playing it)
The Scary Factory Overlooking the Small Village - geosautus ***
Mystery Mine - geosautus
Adventure in Ruins - Ciao_PSN
Dungeons Sack Dragons: The Fall of Valadia. Chapter 2. -FrikyJack
Fortress Ironside - ZX497
In the Belly of the Beast (Demonic Dark) - MostEvilMilo
Uncle Fritz's Fabulous Funhouse Frenzy! - thekillermiller
Tale of the Magnificent Ruby - geosautus
Little Dead Space 2 - DarknessBear
Sci-Fi World!!! - mdaj
Jack McSetback & the Buccaneers Booty - Wyth
Lost Tomb of Anubis - Nattura
The Crystal Cave in Autumn
Sack Cola Investigation - Drift05
Cosmic Conundrum - Foofles
Sackboy In SAcktown - jump_button
The Untenanted. - Veragic
The Not-So-Ancient Ruins - The_Pemp_Wei
From Siberia With Love Pt.1: Infiltrate - GrantosUK
Legend of a Hero - Miglioshin's Fantasy Adventure (ch.1) EX -Miglioshin
Little Big Killzone - slangemannen
Invasion Earth : Eve of Destruction - Kiminski
Lara Cloth : Tomb Raider - Kiminski
Beautiful Landscapes. - Fifou18
Basilisk Bog - mrsupercomputer
My Friend Frank - benzo3000
Fantasy Forest - Nattura
Quiet Ocean - Kiminski
Secret Garden - KiminskiMultiplayer ShenanigansLOCORACE - z_maxpower
LITTLE BIG GLADIATOR, 6 AWESOME PRIZES,3-2-11GO!!! - ManchesterMan22
Roller Coaster - kendereHumour Disco Gone Wrong - polishgamer
Toilet Trouble - LukeinDeidre
The morning after the night before. - AndyP25
Anti-LBC1: A Very Sony Christmas - Teebonesy
Miscellaneous
Libidius.jp - RRR30000 (Arcade Shooter)
Libirius.jp - RRR30000 (Tetris)
Blargh-di-blargh - Blagman
Destiny Bird - Sackjurble
??unreadable japanese text??? - youjoh (great pinball level)
Super Libidius - RRR30000
Day Night Example - reinheart (how to do day to night changes within a level)
Little BIG Planetoid Monthly - LBPlanetoid (new stickers every month)
How Not To Make A Level - MalteseAssassin
paint shop - NemesisNinja (stickers of EVERY colour)
The Movies - Teebonesy (great B&W cinema tribute level,funny too) ***
Park And Rollercoaster!! v3.0
Sweet Connect Four Machine - Jiggles
Huge Pinball Machine JPN by KB-Fran7
Torn by Darkness - Stampy83 *** (LBP goes abstract)Music & Lights
GAF Sky Rocket - ne0ism-
LEDicrous Race - RyanardoDaVinci
Light Show Wave Stage and Fireworks - jesseBoke
littlebigjazz - Hatimitu-Boy
illumina garden - ShadowFlareX
Silhouette Flowers - gehaa
GRCADE Forum LevelsJigglesHeist (Part 1)
Heist (Part 2)
Heist (part 3)
Sweet Connect Four Machine
Jules100 (PSN julesyjules)LittleBigPac-man Platformer
Jack, Sack & the Beanstalk
TRON
STAR WARS : A New Hope : Chapter One : err...Etc!
Skarjo Solve my Maze!
Termite Troubles Part 1; Queenie
Termite Troubles Part 2; The Princess
Echarin (PSN PuppetSJ)Mountainous Merriment
Three-Timer v1.0
City in Flames - Above and Below v0.9
Little Big Astronaut
Agent47ReSACKent Evil: Chapter 1
ReSACKent Evil: Chapter 2
SQFNBKFor Emma, Forever Ago
Gears of Woah!
Bloop (PSN JollyGoodOldFish)Nothing in Particular, Part 1
Look Over There (PSN look-over-there) Inaccurate Representation Of a Construction Site.
SillySproutDay Trip To Great Yarmouth
Pred (PSN RoughOutline)Total Wipeout: The Qualifier
Akai_XIIILittleBigMine Pt.1