I'm posting this link with three awesome lists of resources for brushes in both forums because it will benefit users of both PS and PSP. She shares the links to the brush creators websites but notes (asks) on her page to give credit to the place you actually download the brushes from... So, please do as she asks and give proper credit when you do download and use them. 
enJoy!
Great list Shawna! I'll have to check that out when I have some more time.
Wow, this a a great list. I randomly clicked through some of the links, and many of the sites have more than brushes! Thanks!
Nice list. That will take a while to browse through.
This list could keep me browsing for days. Thanks for the link.
My list isn't as comprehensive, but, there are some differences.
http://suruha.com/thebackofamonkey/resorces/
Pay no mind to the name of that link. My pc guy has a weird sense of humor.
And, he can't spell, either. LOL
Su