Question: How can I add an icon to my Rails application (to show in tabs when opened in a browser, etc.)?

Answer: 
You're talking about a `favicon`.

Add this in the `head` part of your layout:

```
<link rel="shortcut icon" href="/path_to_your_pic"/>

```
Just so people know, the "document root" where you place your favicon.ico is the "public" folder. As a Rails newb I thought it would be in the root of the entire application. 

Also, you may have to clear your cache for it show up.