One of the easiest places on the net to find icons has got to be iconfinder.net. The slick interface allows you to browse, search or quickly look through a huge selection of high-quality icons by tag, as well as filter by icons that are free for commercial use or personal use only. Icon sets are clearly labeled with whatever flavor of Creative Commons license applies. I find this Creative Commons license labeling to be as valuable as anything else about the format of the site: if you don’t have to spend time trying to determine whether or not an icon or a whole icon set is usable for a given project that you’re doing it makes it a lot easier to sift through many, many of them find the icon that is perfect for the job.
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