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If you check your access_logs, you will probably see 404 errors where
somebody tried to download favicon.ico and couldn't find it. -Larry
An icon is not an ordinary image file. It's layers of at least two images in varying resolutions - I use 16 X 16 and 32 x 32. png2ico converts them to favicons.
Put them in the root of your directory and in each sub-directory and it will kill the entries in your error logs for favicon.ico (the browsers request it, not users.) Add the code mentioned above to your web pages. You may need to bookmark the site at least once for the favicon to show up in the address bar. Sometimes it doesn't stick at all. :-)
If you have transparency issues with the favicon, play around with the alpha settings in .png, I can't remember exactly how I did it but you can get transparency to work with them.