Doug Turner has been doing some great work to get our Gecko rendering engine up and running on Windows CE. As I understand it, the browser that comes with many of these phones is IE 3. Wouldn't you rather have a browser that was built for the 21st century :-)
Here's a snapshot I took of a cell phone running with Google.com loaded up in a Minimo (Gecko for small devices) browser. Great work, Doug!
Windows CE developers are invited to help contribute to the port, particularly in the areas of Windows integration and the user interface. The relevant tracking bug is bug 277211.
You can find a bit more information at my post from December 08, 2004.