Axialis IconWorkshop 

Use the industry standard to make, edit, convert Windows® and Macintosh® icons. It supports all formats up to Vista (PNG compressed icons) and Tiger (OSX 10.4). Hundreds of features permit to produce hi-quality icons using a professional workspace.
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Basic Pack Icon Collection 

The Basic Pack Icon collection, was designed using soft bevels and fresh colors with 110 icons for use in toolbars and navigation elements.
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xp and mac style icons Free 

100 XP style icons for your web and software projects. Each icon is available in four different sizes and six different extensions.Sizes: 48x48, 32x32, 24x24, 16x16 pix. File types:PNG,TIFF,BMP,GIF,ICO,ICNS; (32 & 8 bits)
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