Microsoft has released a Home Screen add-on called MSN Direct that displays News, Weather and Stocks in a bubble on your home screen. Selecting any of the sections will launch a full screen application with which you can browser Weather forecasts, Various new items, and Stock indices.
There are links to Microsoft services (or ads? call them what you will) injected into the home screen menu.
MSN Direct is not available as a stand-alone application, it can only be run from the Home screen using the MSN Direct Theme, which I find annoying.
If you are using a non-fixed height Home screen Theme (like any of the themes on this site) this is a decent plug-in, though it takes up a little too much screen real-estate for my liking.
Caution: Before installing this theme, make sure you are using a non-fixed width theme. When installed MSN Direct will inject itself into your current theme directly below the Date/Time lines.