This isn't one of those that you are required to read before opening a new topic. All of these topics have been replaced by new topics or closed for various reasons. The only reason they are here is for historical content, and the fact that it's always good to see what HP fan's of the past were up to. Who knows, maybe you'll find a good theory or two while reading.
At any rate, here is the masterlist of the Archived Threads.
Books
Gleam of triumph
In essence divided - making sense of Dumbledore's machines
Remember My Last
How do you think Book 7 will end?
Citations v.1
Connections between HBP and COS
Did Snape really switch sides?
Die, Ron, Die
Interesting theories on Books 6 and 7
Dumbledore in Book 7
Dumbledore's scar
Finnish HBP Cover
Foreshadowing a Young Death?
H/G & R/Hr v. H/Hr Debate Thread
H/G & R/Hr v. H/Hr Debate Thread
H/G & R/Hr v. H/Hr Debate Thread 2
H/G & R/Hr v. H/Hr Debate Thread 3
H/G & R/Hr v. H/Hr Debate Thread - The Future
Harry/Ginny Thread 1
Harry/Ginny Thread 2
Similarities between Harry Potter and the Matrix
Harry right about Snape's Occlumency?
Harry will live in the 7th Book
Harry/Hermione Thread 1
Harry/Hermione Thread 2
Harry/Hermione New Start
How did Voldemort survive?
How did your HBP Theories Fare?
Harry a Horcrux? V. 1
Harry a Horcrux? V.2
Luna
New Chapter Poll Chronicles
7th Book Title
Petunia - What is she?
Professor Umbridge
RAB - The Original
RAB Thread 2
RAB Thread 3
RAB Thread 4
RAB Thread 5
RAB Thread 6
RAB Thread 7
RAB & DD connection
Ron/Hermione Thread 1
Ron/Hermione Thread 2
Ron/Hermione Thread 3
Ron and Harry Will Both Die
Snape and the Potter Parents Triangle
Snape as DADA in HBP
Snape's 'stopper in death'
The Missing Sentence
The Death - The Original
The Death Thread 2
The Death Thread 3
The Official Half Blood Prince Thread
The Toilet Bowl
Voldemort's Horcruxes
War, What do you think?
What are the 7 Horcruxes?
Will Harry Return to Hogwarts?
Who will die: Harry or Voldemort?
Who is Snape Really Betraying - Thread 6
Who is Snape Really Betraying - Thread 5
Who is Snape Really Betraying - Thread 4
Who is Snape Really Betraying - Thread 3
Who is Snape Really Betraying - Thread 2
Who is Snape Really Betraying - The Original
Movies
I think the 4th movie will please fans
GoF Trailer
Emma Watson
Elizabeth Hurley - Bellatrix?
Daniel Radcliffe official fanclub
GoF Casting Complete and OotP Confirmation
Hi-res PoA Photo's
I think GoF will displease fans
Is Luna going to be in the Movie?
OotP taking 3 years to come out?
Will GoF be PG or PG-13?
Prisoner of Azkaban: PG
Has anybody seen PoA yet?
The Dursley's in OotP?
How do you feel about GoF? After trailer...
Yay, someone who thinks like I do! (critic of POA)
Real life
Death Row
Euthenasia
bush or kerry?
Abortion
Hurricane Katrina
The New Pope
The Religion Discussion
Just to get away from Life
Thread for the Oldies
What is a Thewilisian?
What will you be doing July 16th?
What's your name?
Riddles and Jokes
When's your birthday?
When's your birthday?
Movie Game
How old are you?
What country are you from?
Where are you?
Where do you live?
Lounge
Sorting Hat
Sorting Hat V. 2
S.P.E.L.L V. 1
HBP Chapter Images
When will you get HBP?
Survey: How has Harry Potter affected your life?
When is the next book (HBP) coming out?
What Teacher would you be?
Trivia Duelling - The Original
Trivia Duelling - Thread 2
The Last Word in Book 7
For Alan Rickman Fans
Your Patronus
Site History
Debate v. Confrontation - Ships Warning
Fanfic Reviews
A New Forum (great hall announcement)
Fanfic Review Competition
Forums Downtime
Forums Plans for July 16th Weekend
Happy B-Day to Darren and Matt
Happy Easter
Introduction Thread - *The* Original
Introduction Thread v.2
Merry Christmas
New Fishies
New Forums Announcement
New Forums - General Books
New Rules
Server Change
SPIMF - Society for the Protection of Ingenious Muddy Footprints
Some Rules Changes
Hooray! for Mod's!
WE'RE BACK
What's up with the '?' ?