One tool for all your needs: IconWorkshop is professional tool designed to Create, Extract, Convert, Manage and Redistribute Windows® and Macintosh® Icons. Many features permits you to create high quality icons in minutes. Support for Vista® icons with embedded PNG compression. Convert icons between Macintosh® and Windows® in a click, create icons from PNG images...
Tools include automatic image format creation, creation of icons from images including PSD, PNG, JPEG2000, cross-platform conversion, automated batch processing and a Photoshop transfer plug-in. Produce icons up to 256x256 using a fully integrated workspace. It supports the Vista icon format featuring PNG-compressed 256x256 images. It includes a library of 150 image objects. You can also export your icons to Web-optimized GIF images.

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