IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Faviconer - Faviconer.com, or favicon generator, is online tool for creating favicon.
IconsExtract - Extract icons and cursors stored in EXE, DLL, OCX, CPL files
ConvertICO.org - Create icons from png, jpg or bmp images easily.
IconViewer - Bot Productions's IconViewer utility allows you to view, copy, and save the icons in a file through its property sheet.
Ordinatore - Those who want to tidy up their Macs will surely love this application.