IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
ConvertIcon! - Converticon is a simple icon utility.
Icon Slate - Icon Slate lets you easily compose, import and export desktop icons in many formats.
ConvertICO.org - Create icons from png, jpg or bmp images easily.
Icon Generator - Icon Generator is a little application built on AIR that lets you generate a CS5 or Web 2.
Ordinatore - Those who want to tidy up their Macs will surely love this application.