I've just found the Open Icon Library, which looks to be an interesting and worthwhile project!
Quote
Project Information
Online Icon Gallery: Browse the icon library online
About this project:
A free and open Icon collection. Over 10,000 Unique Icons. Free for anyone to use on you computer, website or any other project. The library is not a theme. Its a centralized source for icons to cover all your needs. The goal is to cover all common apps, operating systems, mimetypes, devices, and country flags.
Whats included:
2272 application icons
258 International flags icons
238 Device icons
69 Operating system icons
731 Mimetype icons
596 Action icons
273 Status icons
Open Icon Library-full v0.10
Statistics:
Total icons: 137,396
Unique icons: 10,787
Unique PNG: 10,489
Unique SVG: 3,723
Open Icon Library-full v0.10
Goals:
Offer a consolidated source of icons for people to custimise there desktop, as they wish, without relying of a single theme.
Offer a free resource for developers looking for icons to use in there free/open projects.
Free/Open Source Icons:
All these are icons are free and open source. That means they are free to use, modify, and redistribute, without any cost. They can be used for commercial and non-commercial projects or products, royalty free. The only requirement is that they remain free and open source, and you have to give credit where credit is due. So if you use the icons in your project, you have to offer the icons or any derivatives of the icons with the same free/open license. How to use free/open icons
Public Domain Icons:
Some of our icons are Public domain. They can be use, modify, and redistribute, without any restrictions. They can be used for commercial and non-commercial projects or products, royalty free. For more info See: Wikipedia: Public Domain
