LIST MOVED TO THE ART101 ACCOUNT
Any questions/comments should be posted there because it's unlikely that this post will be checked again.

I decided to start a list of popular art threads in the Newgrounds Art Forum. It's pretty fun to actually look through them to admire work of other artists and get inspirations from them.
Any suggestions for other categories and links to other popular threads are more than welcome.
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Official Contests:
Ng Miniposters Girl ends APRIL 30TH AT 11:59:59 EASTERN STANDARD TIME
Isometric Pixel Art
Intergalactic V-day
Perfect Pet
Colossal Cock Joke
Newgrounds Holiday
9/12 TRIBUTE
Heavy Metal mag cover
Japanese Vending Machines
Pico Day 08
High-def Sprite
Ng Shirt Design
Ng Diy Munny
Pumpkin Carving
Chest Bursters!
Diy Teddy Troops Design
Ng Print Calendar '09
Tentacle Monsters...

have a suggestion for the next official NG Contest? POST IT HERE
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This is a list of threads that have specific themes, so if your current project fits into one of these POST THEM THERE
15 Minute Sketches Here.,
3d Artists Over Here!!!
A story including you! 2
ABC easy as 123
Anime
Art Forum Revival Project (artrap)
blood and gore
Castle Crashers Fan Art.
Design a weapon!
Doodlage
Draw a dragon or learn how!
Draw A Cartoon Pic Of Yourself!
Draw A Bee
Draw A Superhero
Draw a zombie!
Drawing Monsters
Draw Salad Fingers
Draw The Person Above You
Draw Your Favourit Game Character
Easytoon Animation Showcase...
Furry Art
Grim Reaper Thread
Help him get passed the traps.
I drew a boob
I drew a penis
im 13 or 14 and awl draw u
iscribble!
Let's draw Blockhead!
Lewd Cathouse Banners!!!
Lined Paper Sketches
Madness Fan Art!
Movie Characters.
My First Sketch with a tablet!
Newgrounds Artpad Thread
Newgrounds Staff Style
NG Graffiti & Tagging
Official Graffiti Playdo Thread.
Photography
Post Your Abstract Artwork!
Post Your Spengbab Drawnings!!
pico drawing thread
Self Portrait thread
Silly Spongebob
Sonic Art
Steam powered mech/robots
Stupid Animated Gifs Thread
Teh Pixels Thread!
The Eye Topic, Post Eye Drawings!!!
The MS-paint thread
Tracing thread
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COLLABS:
Food Chain Collab Finished: Link to Flash
Newgrounds Rail Collab Finished: Link to Flash
NG Poster Collab Finished: Link to Flash
NG Sketchbook Tour 2006 Collab Finished: Link to Flash
NG Sketchbook Tour 2007 Collab Finished: Link to Flash
NG Sketchbook Tour 2008 Collab Finished: Link to Flash
NG Sketchbook Tour 2009 Collab in progress
Metropolis Disaster Collab Ended, don't post any more entries
Storybook Project Collab Ended, don't post any more entries
The Red Line Collab Finished: Link to Flash
The Zoo Collab Finished: Link to Flash
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COOL PROJECTS
Building MindChamber
How To Make A Wooden Sword
Hot Porn ( But Better )
I desecrated a famous artwork!
Re-imagining of Optimus Prime.
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MISCELLANEOUS:
*ART FORUM RULES*
Art Forum Lounge
Art Request Thread
Art forum 'tech support' thread!
Photoshop help center.
The Official Deviant Art Thread
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PERSONAL ART THREADS. There's a bunch out there in the art forum, people sometimes even lose their own threads, so I'll help organize this crap. Post your own if I missed it (which is most likely the case since there are a ton of these, and I'm not always sure if a thread is your official one). If you don't want your thread on here for any reason, PM me.

AlexanderTheInsane
AwesomeSaurus
big-jonny-13
BlackmarketKraig
Captain-Ben
ChillyCheese
DooDooMeaT
Dookiemaister
e-m-b-r-i-o
falz3333
Fatchaos
FullFistMaria
Hellknight1000
jagondudo
JohanL
king7272777
LaserKarl
Lemmiwinks91
Lundsfryd
mynamewontfitin
ngmastah
ornery
Penboy
PrinceFlea
RadioactiveRabies
raveninskyprime
ScorpianX0
ShadowNazi169
Spaghetti14
SpencerMann
threadwood
UnderARock
Vortex00
Vousielle
W0oJ0o
x-factor11
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Now another list of contests which were created by regulars to entice fun and competition around the art forum:

C.O.W. (Creature of the Week)
1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 / 41 / 42 / 43 / 44 / 45 / 46 / 47 / 48 / 49 / 50 / 51 / 52 / 53

C.H.O.W. (Character of the Week)
1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28

E.O.W (Environment of the Week)
1 / 2 / 3 / 4

Doubles Showdown
1 / 2 / 3 / 4 / 5

Wacom Nude Portrait Contes
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Locked Threads and Why They Were Locked

Custom Pokemon Fusions!: taking someone else's work and manipulating a couple of things to make it look different...
Destroy That Character!: It started out fine and lived on for quite a while without many problems, but the large amount of people spamming the thread with effortless crap just made it an obvious lock.
The freakin' huge house adventure!: started out well...ended with crap.
Pivot Stick Figure Showcase: The first "official" thread created to showcase work done on pivot. Largely due to the lack of any rules/regulations, was flooded with terrible work that took little effort or talent.
The Pivot Showcase: The second thread created to hopefully revive the topic and enforce the new rules. Same thing brought this thread down. An overwhelming amount of users just posted garbage in the thread, leading to its downfall.