If you notice your http error logs with a lot of messages such as "File does not exist: ... favicon.ico". You are missing an icon for your website which is displayed in the browsers location bar and also within the browser bookmarks.
Here's an easy way to create one with Gimp:
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Open the image you want to create the icon for, with Gimp.
Resize the image to a 16x16 pixel.
When you go to save, "Select File Type (By Extension)".
Save as "Microsoft Windows Icon" -- ico .
Name it "favicon.ico".
Upload the favicon.ico file to the websites home directory.
When you visit your website, you should now have a cool new icon displayed within the browsers location bar!!