Whenever I use Google Reader I pin its tab so only the favicon is visible. When I do this, the title of the page is, of course, not visible so I have no way of seeing how many unread Google Reader items I have. Is there any extension or userscript that will put the unread count in the favicon? Almost like how the Stack Exchange Userscripts will do this for unread chat messages.
The Google Reader Notifier extension will give you a Google Reader icon with a count that you can click in your extension section. It was created by Google and is full-featured.