Iconus is an icon viewer that allows you to drag-n-drop dll, exe, icl, ico files and view the icons inside.
Iconus is portable and will need to be extracted to a folder and run from there. The interface is small and easy to use with a file menu including View, Common Libs, Tools, and Help. A total list of icons are shown at the bottom, and Iconus pulls icons you probably didn't know or forgot about.
Right-click on any icon and you can get a detailed report, autosave or save. Detailed Reports will tell you how many versions of the one icon exist and what the sizes are as well as the location.
Common Libs allows you to choose what category of icons you are viewing. There are eleven choices here, and you can also edit the list or reload it at any time.
Overall, Iconus is a pretty click app to extract or view icons with more than enough features for the power user.