Potter Sims

Students:

Male Heads
Female Heads
Marauder-Era
Uniforms
Individual Outfits

Adult Sets:

Professors
Order
Death Eaters
Misc

Official Pages

http://thesims.ea.com/
The Sims Official page. Some good objects if you're using a PC

http://www.aspyr.com/
Official Homepage for the company that releases the Mac version

Meshers

I got my meshes from these people. A big thanks to all of them. They are incredible at their work.

http://www.simfreaks.com/
Incredible meshes and skins. Many of my heads come from Fionns RealHead series.

http://jerome.simfreaks.com/
I am absolutely in love with these meshes. Only bodies available, but they are the best around.

http://www.jeanniesbottleofsims.com/
Not only does Jeannie have some great meshes, but she also has great skins

http://vardari.to/sims/index.html
Some of the loviest meshes and skins I've yet found

http://www.welldressedsim.com/
My Lucius head came from here.

Harry Potter Sims Sites

http://www.the-happy-house.com/hp/thesims.html
Has some nice child Student skins and both child and adult Quidditch robes

http://simmingtonsquare.com/
Has great Harry Potter houses

http://www.cheapfrills.org/
Has some very cool things, including a flying broom

http://skadi.sims.tripod.com/hpotter.html
Some fantastic HP pictures for your walls

http://www.thesimstimes.com/
This site has floating candles, like in the Great Hall

General Sims Sites

http://www.7deadlysims.com/
One of the Best Sims sites on the Net