A lot of people (including myself) are under the delusion that you need detailed, descriptive icons. Most of the time your design will benefit from a simple representative glyph.<p>That being said, the "Fugue" icon set would have to be the greatest icon set I have ever crossed paths with. With 2000+ beautifully designed, crisp icons, most of your needs will be met. The license is attribution or you can simply pay $49.95 for royalty free.<p><a href="http://pinvoke.com/" rel="nofollow">http://pinvoke.com/</a>