Reset favicon cache
By Anatoly Mironov
Favicon is one of the hardest. Ctrl-F5 doesn’t help. You can of course see the source, find the location of the favicon, click on it (if you use Firefox or Chrome), otherwise copy the url and paste it in the address bar. When you load it separately, the favicon cache is renewed. It works. But if you want to make it easier for your users, set a version to your favicon file in the masterpage:
<SharePoint:SPShortcutIcon runat="server"
IconUrl="/\_layouts/images/Contoso/favicon.ico?v=20111024" />
```A **?v=** and current date will work fine. The same you can do with [javasript](http://stackoverflow.com/questions/32414/how-can-i-force-clients-to-refresh-javascript-files) and css files and other images