Icons
Quality free icons to everyone
The icons are licensed under a Creative Commons Attribution 3.0 license 
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Fugue Icons 2.6.2d (March 8, 2010)
2,617 icons are included in PNG format (16x16 pixels) + bonus.
e.g., application, image, monitor, select, user.
Diagona Icons 1.0
400 icons are included in PNG format (10x10 and 16x16 pixels).