I count 47 AS: threads now. Once again, many thanks to those who have helped create this resource. Keep 'em coming, and if you decide to make one, make sure you link it in here, so it gets added to the list.
BASIC
AS: Basic A.I. by Dancing-Thunder
AS: Clock by Glaiel_Gamer
AS: Conditions and Loops by BleeBlap
AS: Duplicated Movie Clips
AS: For... in loops by Inglor
AS: Inventory 1 by Inglor
AS: Maths - Basic by T-H
AS: Movement - Basic
AS: Movement - Scrolling background by DrDeath2k3
AS: Password by Dancing-Thunder
AS: Performance & Optimisation Tips by T-H
AS: Preloader
AS: Quality Toggling
AS: Replay Button by Inglor
AS: Sound
AS: Stop & Play Buttons by Inglor
AS: Symbols by Joelasticot
AS: Variables by Dark_Toaster
INTERMEDIATE
AS: Arrays
AS: Camera Control by Inglor
AS: Collisions by Glaiel_Gamer
AS: Collision Detection by BleeBlap
AS: Debugging Syntax by Inglor
AS: Elasticity by Joelasticot
AS: Functions - Basic by Inglor
AS: Intervals by Inglor
AS: Linear Increasement by Inglor
AS: Load External Data/Cross-Domain
AS: Maths - Intermediate by Inglor
AS: Maze by Begoner
AS: Movement - On slopes by Joelasticot
AS: Output Panel Manipulation by Inglor
AS: Platform Game Basics by Atomic_Sponge
AS: Pong physics & gravity by Dark_Toaster
AS: Save and Load
AS: SWF right-click menu
AS: Typewriter Effect by Atomic_Sponge
AS: Volume Slider by Star_Cleaver
ADVANCED
AS: API by -liam-
AS: Binary Increasement by Inglor
AS: Syntax Checking Stack by Inglor
AS: Modular Programming by Inglor
AS: Tile Based Game Development Map by Inglor
AS: Movement - Random by Begoner
AS: OOP (Object Oriented Programming) by Inglor
AS: Trigonometry by BleeBlap
AS: XML by Inglor