This is more of a list than a question

I'm listing some good CC sites for people to use. Feel free to reply with your own favorite CC sites!

There's plenty of good stuff right here on MTS.
Anubis Under the Sun has great female hair and Young Adult/Adult female clothing, but doesn't have too much to offer male Sims.
Poppy Sims is THE BEST PLACE to find maternity clothes for your adult and teen Sims.
Lotus's Journal (search it on google, you'll find it) has plenty of female hairs as well, but again is lacking in hair for your Sim men.
Pixicat has fantastic shoes.
LianaSims has good clothes for children.
Skysims has tons of clothes to choose from!
All About Style has a lot of Sims 3 clothes, but it's harder to find the Sims 3 section. Google "All About Style Sims 3" and you should find it. They have a lot of branded VS Pink clothing if you like that
NYgirl Sims has lots of clothes, for both male and female Sims of all ages.
My Sims 3 Blog is like a master list of all the best CC. There's a filter on the right side of the page so that you can select what you're looking for, so don't say it's hard to navigate unless you're trying to find hair (hair is a bit more difficult as it is organized by creator)
Around the Sims 3 has both furniture and CAS materials. They have a playpen that works w/o the Sims 3 Store version installed!
simsxolove has a bunch of hair conversions for children (making EA adult hair child-compatible) and some EP and Store hair made base game compatible.
QuizicalGin has a bunch of stuff, mostly for toddlers. Have you ever wanted your toddler to sleep in a bed instead of a crib? She's made toddler beds!

If you know any good sites for male hairstyles, that would be especially appreciated as I don't have any listed here. Thanks!

Well Simcredible is one of my favorites, and it's brazillian. ♥

You left out Simlogical http://den.simlogical.com/denforum/

Here's some I enjoy:
Sim-pli Caz: Clothing and shoes.
Rusty: Gorgeous looking clothing for males and females.
BEO CREATIONS: Wedding dresses & more.
BEAVERHAUSEN: A must for hair (and male hair).
modish kitten - sims 3: Some beautiful urban vibe stuff.

I use all types of sites, too numerous to list here and for me to remember them all. If I want to keep up with the latest in downloads, I come here, TSR, and always check MySims3Blog. Yeah, still love that site. It does have listings by labels on the right side of the page, click it and scroll down to what you are looking for, example: male hairs.

I mainly use here and TSR and http://www.lorandiasims3.com/index.php

Some of my favorites, that I didn't see listed...

BauFive at http://www.b-5studio.com/ - eclectic, also home of the extraordinary Grant Park Build sets
Luna at http://lunasimslulamai.jimdo.com/ - Build and buy, wonderful imagination

Sims 3 Updates posts the latest cc everyday: http://www.sims3updates.net/
Also, if hair is your thing, check out this database of hair cc: http://simshairs.com/