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.