Resources

Charts

Crochet

Snape Graph Ghan (v2), by Becky

Knitting

Charms, Curses & Spells

Patronus Intarsia Pattern, by Noelle 

Fan-tastic!

Deathly Hallows Chart, by Gini
Deathly Hallows Fair Isle Chart, by Emma T. Meador
Harry Potter, by Mauricette

Hogwarts & the Four Houses

Gryffindor Crest, by Hardhat_cat
Gryffindor Crest (v2), by Mauricette
Gryffindor Crest (v3), by Lorraine Gaze
Gryffindor Fair Isle Crest, by Rosemary Waits (a.k.a. Quietish)
Gryffindor Intarsia Chart, by Alyssa Wilson 
Hogwarts Crest, by PJ 
Hufflepuff Crest, by Hardhat_cat
Hufflepuff Fair Isle Crest,by Rosemary Waits (a.k.a. Quietish)
Hufflepuff Intarsia Chart, by Alyssa Wilson 
Ravenclaw Crest, by Hardhat_cat
Ravenclaw Fair Isle Crest, by Rosemary Waits (a.k.a. Quietish)
Ravenclaw Intarsia Chart, by Alyssa Wilson 
Slytherin Crest, by Hardhat_cat
Slytherin Fair Isle Crest, by Rosemary Waits (a.k.a. Quietish)
Slytherin Intarsia Chart, by Alyssa Wilson 
Slytherin's Serpent, by Purly
Wit Beyond Measure Chart, by Emma T. Meador 

Hogwarts Professors

Rubeus Hagrid

Hagrid, by Lorraine Gaze

Hogwarts Students

Harry Potter

Harry & Hedwig, by Mauricette
Harry Flying, by Mauricette
Harry Potter, by Lorraine Gaze
Harry Potter (v2), by Lorraine Gaze
Harry Potter (v3), by Lorraine Gaze
Harry Potter (v4), by Lorraine Gaze
Harry Potter (v5), by Lorraine Gaze
Harry Potter & Owl, by Lorraine Gaze

Hermione Granger

Hermione Granger, by Lorraine Gaze
Hermione Granger (v2), by Lorraine Gaze
Hermione Granger (v3), by Lorraine Gaze

Ron Weasley

Ron Weasley, by Lorraine Gaze

Magical Creatures

Dobby, by Lorraine Gaze
Fluffy, by Lorraine Gaze
Griffin, by Lorraine Gaze
Phoenix Rising, by shewhoknits
Tribal Dragon, by Linda "Raven" Parlier
Tribal Unicorn, by Linda "Raven" Parlier

Magical Objects

Sorting Hat, by Lorraine Gaze

Quidditch

Golden Snitch, by Lorraine Gaze
Golden Snitch Chart, by Freshisle Fibers

Wizard Wear

Hermione's Fair-Isle Sweater, by Eca

PES

Gryffindor PES Chart (Goblet of Fire Version), by Coolscaryguy

Costuming and COSplay

Difference in School Uniforms Between the Harry Potter Movies, by Jennifer
Harry Potter Costume Cabaret Video, by cospnews.com and costumebeginner.com; presenters: Lil, Aurora Celeste, Lieran and Tara
Note: Special thanks to the PotterCast elves for transcribing those 2 videos!!
How to Make a Death Eater Costume, by about.com's DIY Fashion section NEW!!
How to Make a Draco Malfoy Costume, by about.com's DIY Fashion section NEW!!
How to Make a Harry Potter Costume, by about.com's DIY Fashion section
How to Make a Hermione Granger Costume, by about.com's DIY Fashion section NEW!!
How to Make a Lord Voldemort Costume, by about.com's DIY Fashion section NEW!!
How to Make a Lucius Malfoy Costume, by about.com's DIY Fashion section NEW!!
How to Make a Luna Lovegood Costume, by about.com's DIY Fashion section NEW!!
How to Make a Ron Weasley Costume, by about.com's DIY Fashion section NEW!!
How to Make a Severus Snape Costume, by about.com's DIY Fashion section NEW!!

Fonts

Harry Potter Font
Hogwarts Wizard Font
Lumos Font
Magik Font
Moonstar Font
Parry Hotter Font
Parseltongue Font

Supply Recommendations

Yarn

Yarn Recommendations for Hogwarts' Scarves, by Laura Kent