It's really simple to create. Just download and install WebDesktop. Once you have it running, open the BottomLine location via the WebDesktop -> Open Location menu item. You'll want to use the regular URL and not the JavaScript popup version.
Once the applet is loaded, simply resize the WebDesktop window using the widget at the bottom right so it looks good, then move it to the bottom of the screen. When you switch to a different application, WebDesktop's title bar disappears, leaving you with the spiffy looking BottomLine, the envy of all your friends.
[robg adds: WebDesktop is somewhat like GeekTool, a previous Pick of the Week, except that it can display full web pages instead of just images. If you've got the screen real estate for it, this really opens up a world of possibilities for continually updated background information...]

