Here are a bunch of websites that I find very useful when I work on my artwork :]

DEVIANTART
 http://www.deviantart.com/
Uhm. Basically you can find ANYTHING you want or need here. Stock photos. Textures. Brushes. Patterns. And even ideas! Deviantart is my hero.
And if you care.. you can find my own deviantart account at lynniesparrow.deviantart.com.

DAFONT.COM
 http://www.dafont.com
A huge collection of fonts to download for your PC and MAC.

ECHOICA.NET
 http://echoica.net/brushes.php
A variety of brushes you can download for photoshop.

CSS BEAUTY
 http://www.cssbeauty.com/
This site has a gallery of really creative websites people have made using CSS. It's a great place to go for inspiration.

VBRUSH
 http://veredgf.fredfarm.com/vbrush/main.html
Here you can find brushes, tutorials, and a brush search engine which I have used many times.