Shawn Rubel from Vecteezy offered you guys, the readers of this blog, access to 40 free and exclusive SEO & Development icons.
All icons are licensed under the Creative Commons Attribution 3.0 Unported License.
You can find the icons here: SEO & Development Icon Set. Feel free to use and alter them for any application. The iconset includes both the .PNG preview as well as .PSD, .AI and .EPS files which can be used within most image editors.