Thats right, the upcoming version of Safari 4.0 has this cool little feature known as Web Apps, and from what I can tell, it sets the default icon for the saved “Web App” with a site content thumbnail. It looks a bit weird to be honest, so I’m designing a set of icons that are reflective of their website. I will be uploading the first set, which is for Facebook and YouTube, in a little while, look out for a preview and a download link here soon!