This pastebin is not being maintained, has lots of broken links, and is mostly kept as a legacy in case the arch.413chan.net archive comes up again
 
This one is being kept up to date and maintained now:
http://pastebin.com/gUBtvRZH
 
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This is a list of all the /co/ and /mlp/ threads where live discussion took place on episode premiere days.
 
The archive containing the first two episode discussion threads was made by Anonymous.
The 413chan.net archive was created and is maintained by Archive!noTe.poNY.
 
This script provides 4chanx like features to the archived threads:
https://dl.dropbox.com/u/77412572/archivechan.user.js
 
Some episodes were leaked before their premiere date and are marked with an asterisk(*).
 
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Season 1
 
 
The first two episodes were aired before the archive was made and are a part of this index instead.
http://www.mediafire.com/?84r32fbc4gyk313
 
Extract the folder and open the index.html, then navigate to the thread with the corresponding post number.
 
Friendship is Magic, part 1 (S01E01):
20460984
 
Friendship is Magic, part 2 (S01E02):
20707693
 
The Ticket Master (S01E03):
Unknown
 
Applebuck Season (S01E04):
http://arch.413chan.net/co21009304.html
 
Griffon the Brush-Off (S01E05):
http://arch.413chan.net/co21163417.html
 
Boast Busters (S01E06):
http://arch.413chan.net/co21317001.html
 
Dragonshy (S01E07):
http://arch.413chan.net/co21464798.html
 
Look Before You Sleep (S01E08):
http://arch.413chan.net/co21623781.html
 
Bridle Gossip (S01E09):
http://arch.413chan.net/co21797225.html
 
Swarm of the Century (S01E10):
http://arch.413chan.net/co21964035.html
 
Winter Wrap Up (S01E11):
http://arch.413chan.net/co22135138.html
 
Call of the Cutie (S01E12):
http://arch.413chan.net/co22439901.html
 
Fall Weather Friends (S01E13):
http://arch.413chan.net/co22992939.html
 
Suited For Success(S01E14):
http://arch.413chan.net/co23183721.html
 
Feeling Pinkie Keen (S01E15):
http://arch.413chan.net/co23383886.html
 
Sonic Rainboom (S01E16):
http://arch.413chan.net/co23587721.html
 
Stare Master (S01E17):
http://arch.413chan.net/co23798408.html
 
Show Stoppers (S01E18):
http://arch.413chan.net/co24002498.html
 
A Dog and Pony Show (S01E19):
http://arch.413chan.net/co24198576.html
 
Green Isn't Your Color (S01E20):
http://arch.413chan.net/co24389043.html
 
Over a Barrel (S01E21):
http://arch.413chan.net/co24565354.html
 
A Bird in the Hoof (S01E22):
http://arch.413chan.net/co24950422.html
 
The Cutie Mark Chronicles (S01E23):
http://arch.413chan.net/co25137987.html
 
Owl's Well That Ends Well (S01E24):
http://arch.413chan.net/co25328742.html
 
Party of One (S01E25):
http://arch.413chan.net/co25494720.html
 
The Best Night Ever (S01E26):
http://arch.413chan.net/co25694457.html
 
 
Season 2
 
 
The Return of Harmony Part 1 (S02E01):
http://arch.413chan.net/co29745610.html
 
The Return of Harmony Part 2 (S02E02):
http://arch.413chan.net/co29950754.html
 
Lesson Zero (S02E03):
http://arch.413chan.net/co30585727.html
 
Luna Eclipsed (S02E04):
http://arch.413chan.net/co30783430.html
 
Sisterhooves Social (S02E05):
http://arch.413chan.net/co31196411.html
 
The Cutie Pox (S02E06):
http://arch.413chan.net/co31419177.html
 
May the Best Pet Win! (S02E07):
Unknown
 
The Mysterious Mare Do Well (S02E08):
http://arch.413chan.net/co31753837.html
 
Sweet and Elite (S02E09):
http://arch.413chan.net/co31957861.html
 
Secret of My Excess (S02E10):
http://arch.413chan.net/co32184378.html
 
Hearth's Warming Eve (S02E11):
http://arch.413chan.net/co32419108.html
 
Family Appreciation Day (S02E12):
http://arch.413chan.net/co33024844.html
 
Baby Cakes (S02E13):
http://arch.413chan.net/co33249967.html
 
The Last Roundup (S02E14):
http://arch.413chan.net/co33468411.html
 
The Super Speedy Cider Squeezy 6000 (S02E15):
http://arch.413chan.net/co33716677.html
 
Read It and Weep (S02E16):
http://arch.413chan.net/co33950426.html
 
Hearts and Hooves Day (S02E17)*:
http://arch.413chan.net/co34102575.html
 
A Friend in Deed (S02E18):
http://arch.413chan.net/mlp48199.html
 
Putting Your Hoof Down (S02E19):
http://arch.413chan.net/mlp359020.html
 
It's About Time (S02E20):
http://arch.413chan.net/mlp505973.html
 
Dragon Quest (S02E21):
http://arch.413chan.net/mlp644320.html
http://arch.413chan.net/mlp645748.html
 
Hurricane Fluttershy (S02E22):
http://arch.413chan.net/mlp805039.html
 
Ponyville Confidential (S02E23):
http://arch.413chan.net/mlp950244.html
 
MMMystery on the Friendship Express (S02E24):
Unknown
 
A Canterlot Wedding (S02E25+26):
http://arch.413chan.net/mlp1419847.html
http://arch.413chan.net/mlp1422821.html
 
 
Season 3
 
 
The Crystal Empire (S03E01+02):
http://arch.413chan.net/mlp5626821.html
 
Too Many Pinkie Pies (S03E03)*:
http://arch.413chan.net/mlp5813884.html
 
One Bad Apple (S03E04):
http://arch.413chan.net/mlp6005389.html
 
Magic Duel (S03E05):
http://arch.413chan.net/mlp6202810.html
 
Sleepless in Ponyville (S03E06):
http://arch.413chan.net/mlp6393686.html
 
Wonderbolt Academy (S03E07)*:
http://arch.413chan.net/mlp6519395.html
 
Apple Family Reunion (S03E08)*:
http://arch.413chan.net/mlp6754387.html
 
Spike at Your Service (S03E09)*:
http://arch.413chan.net/mlp6929913.html
 
Keep Calm and Flutter On (S03E10):
http://arch.413chan.net/mlp7483105.html
 
Just For Sidekicks (S03E11):
http://arch.413chan.net/mlp7682548.html
 
Games Ponies Play (S03E12):
http://arch.413chan.net/mlp8095676.html
 
Magical Mystery Cure (S03E13):
http://arch.413chan.net/mlp8319440.html
 
 
Season 4
 
 
Princess Twilight Sparkle (S04E01+02):
http://arch.413chan.net/mlp14675205.html
 
Castle Mane-ia (S04E03)*:
http://arch.413chan.net/mlp14757072.html
 
Daring Don't (S04E04):
http://arch.413chan.net/mlp14951304.html
 
Flight to the Finish (S04E05):
http://arch.413chan.net/mlp15083598.html
 
Power Ponies (S04E06):
http://arch.413chan.net/mlp15210440.html
 
Bats! (S04E07):
http://arch.413chan.net/mlp15321831.html
 
Rarity Takes Manehatten (S04E08):
http://arch.413chan.net/mlp15470710.html
 
Pinky Apple Pie (S04E09):
http://arch.413chan.net/mlp15606596.html
 
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Comics
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My Little Pony Friendship is Magic by IDW
 
 
Issue #1:
http://arch.413chan.net/mlp6114009.html
 
Issue #2*:
http://arch.413chan.net/mlp6519402.html
 
Issue #3:
http://arch.413chan.net/mlp7994015.html
 
Issue #4:
http://arch.413chan.net/mlp8851567.html
 
Issue #5:
http://archive.heinessen.com/mlp/thread/9374019
http://arch.413chan.net/mlp9376743.html
 
Issue #6*:
http://arch.413chan.net/mlp9484890.html
 
Issue #7*:
http://arch.413chan.net/mlp10220008.html
 
Issue #8:
http://arch.413chan.net/mlp11316354.html
 
Issue #9:
http://arch.413chan.net/mlp12477819.html
 
Issue #10:
http://arch.413chan.net/mlp13182358.html
 
Issue #11:
http://arch.413chan.net/mlp13724964.html
 
Issue #12:
http://arch.413chan.net/mlp14283464.html
 
Issue #13:
http://arch.413chan.net/mlp14624337.html
 
Issue #14:
http://arch.413chan.net/mlp15154847.html
 
Issue #15:
http://archive.heinessen.com/mlp/thread/S15684568
 
 
Micro Series by IDW
 
 
Issue #1 - Twilight Sparkle:
http://arch.413chan.net/mlp8466265.html
 
Issue #2 - Rainbow Dash:
http://arch.413chan.net/mlp9209073.html
 
Issue #3 - Rarity:
http://arch.413chan.net/mlp10082737.html
 
Issue #4 - Fluttershy:
http://arch.413chan.net/mlp10951041.html
 
Issue #5 - Pinkie Pie:
http://arch.413chan.net/mlp11502743.html
 
Issue #6 - Applejack:
http://arch.413chan.net/mlp11999595.html
 
Issue #7 - Cutie Mark Crusaders:
http://arch.413chan.net/mlp13002938.html
 
Issue #8 - Celestia:
http://arch.413chan.net/mlp13471490.html
 
Issue #9 - Spike:
http://archive.heinessen.com/mlp/thread/S14511504
 
Issue #10 - Luna:
http://arch.413chan.net/mlp15154847.html