Favicon

A favicon is the small icon that appears in your browser next to your site name in the tab, bookmarks and browsing history listings. Learn more at Wikipedia-favicon or Favicon cheat-sheet.

To customize your site with a personal favicon, you create a favicon.ico file and then load it into your Google Site:

First you need to create a favicon.ico file. Google Sites will work with the basic 16x16 pixel .ico file and also supports higher resolutions, regardless of the size it must be uploaded as a single file named favicon.ico.

There are numerous free websites that enable you prepare a favicon.ico file from your existing image or maunally.

Faviconic-Generator - generates icons from images in many sizes
Favicon.cc - create 16x16 icons from image or manual editing
Favicomatic - generates icons from images in many sizes
DynamicDrive's FavIcon Generator and Editor for 16x16 pixel icons

Second add the icon to your Google Site:

Starting on the home page of your Google site,
Select More Actions -> Manage Site -> Attachments
Click Upload
Browse and select your favicon.ico file

That's all. Exit management mode and reload your browser page to verify your site's new personalized favicon!

To change or remove your favicon:

Select More Actions -> Manage Site -> Attachments
Check the box for the 'favicon.ico' entry and use the Replace or Delete buttons.