![Image](http://images.mzzt.net/world.png)
Thought I'd share it.
![Smilesmile :)](./images/smilies/smile.gif)
In Firefox you can install this extention to allow you to change bookmark icons.
There doesn't appear to be a way to change bookmark icons in Opera natively, but maybe there's a tool somewhere for it.
And of course IE integrates favorites with shortcuts so you get a Change Icon button in the properties dialog (you might have to convert it to an icon first, this tool is good for that).