You can find some nice free icon sets from DryIcons.com, the icons are carefully designed and developed by a team of professional web and graphic designers. They designed the DryIcons website to bring your applications the best professional appearance. All of their icon sets contain icons commonly available in 16×16, 24×24, 32×32, 48×48 pixel 32-bit transparency PNG format and 128×128 pixel Photoshop’s PSD image format.

All DryIcons are licensed under a Creative Commons Attribution 3.0 License. This means that you can do pretty much everything with our icons and use them in any personal or commercial projects. However, you must include a link back to http://dryicons.com/ in your credits. I particular like the following sets of icons.

Ruby Multimedia icon set is the new creation of DryIcons’ laboratory. Using only two colors, red and white, we brought style and class to the next level. This set can find its use in lots of projects and applications.

The WYSIWYG (What You See Is What You Get) Classic Icon Set is the first of the DryIcons’ WYSIWYG sequence icon sets, based on the ‘classic’ WYSIWYG look.

“Aesthetica” Icon Set was created to lend visual excitement to your projects. This set is fresh, stylish and modern, all mixed up in the perfect proportions.

Requirements: No Requirements
Demo: http://dryicons.com/free-icons/
License: Creative Commons License