Here are some of my favorite sites for quality web design resources that are free for personal and commercial use*. This is by no means a comprehensive list, just ones that I have found and like.
www.fuzzimo.com: An extensive collection of beautiful high quality free resources for personal or commercial use. Photoshop files, textures, high resolution scans and photos. I used fuzzimo’s scans of old airmail envelopes on my current coyotecreation.com site design.
photoshopisland.com: Nice collection of layered PSD files, Photoshop brushes, and calendar templates. Regularly updated with new freebies.
www.obsidiandawn.com: I love love love Obsidian Dawn. Tons of Photoshop brushes, patterns, web graphics, tutorials..all kinds of graphic design resources, all for free. Serious awesomeness.
http://www.graphicsfuel.com/2010/07/free-resources-for-massive-collection-of-photoshop-brushes: Links to blog posts containing collections of photoshop brushes