Elegant Themes has something beautiful to share: "310 Of The Best Free Icons For The Modern Web".
The icons have been optimized with pixel-perfect detail for 16px, and all are multiples of 16px (32px, 64px, etc).
These icons are dual licensed under the GPL 2.0 and MIT, and are completely free to use.
Icon fonts are great because they are flexible and fast loading. Using a single font and CSS, you can create countless graphical variations that would normally require the use of an equally countless collection of bulky and non-scalable images. Combined with HTML elements, these icons can even turn into beautiful buttons like the download link above!