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As per feedback from Seb Frost, I have added support for the 180x180 Apple Launcher Icon.

The Favicon Cheat Sheet at https://github.com/audreyr/favicon-cheat-sheet is an excellent resource created and maintained on GitHub by Audrey Roy @audreyfeldroy.

Included are links to other favicon resources, recommended code to include in your HTML, recommended image specifications and favicon tools.

Also included are instructions on forcing a favicon refresh which is a very popular question asked on the Internet.

Thanks Audrey!

Thanks @danwood for letting me know about new Apple application icon sizes for iOS7.

Mathias Bynens recently updated his excellent everything you always wanted to know about touch icons article including a link to an official Apple document about Icon and Image Sizes.

It appears that the high resolutions for iPhone, iPod Touch and iPad have been updated as follows:

• iPhone and iPod touch: 114x114 updated to 120x120
• iPad: 144x144 updated to 152x152

The standard resolution equivalents are half the above resolutions which means we will also need:

• 60x60
• 76x76

The updated list of required icons as far as I can tell is now as follows:

• apple-touch-icon.png
• apple-touch-icon-57x57.png
• apple-touch-icon-60x60.png *NEW* *
• apple-touch-icon-72x72.png
• apple-touch-icon-76x76.png *NEW*
  
• apple-touch-icon-114x114.png
• apple-touch-icon-120x120.png *NEW*
• apple-touch-icon-144x144.png
• apple-touch-icon-152x152.png *NEW*

Iconifier has been updated accordingly.

* Update 23/09/2013

As pointed out by Mathias Bynens, it's unlikely that iOS 7 will be made available on non-Retina iPhones and iPads so there’s no reason to include the 60×60px and 76×76px icons.

* Update 07/10/2013

As Ben points out, the 76×76px icon is required so I have added it back in.

Jonathan T. Neal has written a  good in-depth article, Understand the Favicon on the favicon, touch icons and tile icons and the best ways to implement these on your website.

Jonathan also points to another interesting article about favicons, Create the Perfect Favicon from .net Magazine. This is an edited excerpt from Chapter 3 of The Icon Handbook by Jon Hicks.