VistaIcons.com - Free Vista Style Icons , Vista Wallpapers, Free Icon Sets and Windows Vista Desktop Icons
CrystalXP.net - Graphics & Windows Customization
Icon Archive - 13,500+ free icons, buddy icons, xp icons, vista icons, desktop icons, aim icons
Icons from the Crystal Clear icon set
Map Channels Markers
DryIcons.com - Free Icons and Vector Graphics
Iconfinder | Search and download free icons