The section about iOS home screen icons has an error. Retina iPad icons are 144 pixels square, not 114. I wrote a blog post [1] that covers that.

Also, I'd recommend using ConvertICO [2] instead of the X-Icon Editor. It generates much smaller files (4 kb vs. 32 kb).

[1]: http://taylor.fausak.me/2012/03/27/ios-web-app-icons-and-sta... [2]: http://news.ycombinator.com/item?id=4164119