Silk” is a smooth, free icon set, containing over 700 16-by-16 pixel icons in strokably-soft PNG format. Containing a large variety of icons, you're sure to find something that tickles your fancy. And all for a low low price of $0.00. You can't say fairer than that.
A while ago I created a lot of icons for web applications I designed while working for the most excellent employer there is: Manentia Software. Now, we decided to liberate them with a Creative Commons license for everyone to use and enjoy!