Google Maps and Palm OS
Google maps is a free map service, its web page is http://maps.google.com. You can't yet view maps of the whole world, but in America, England etc. If you try to load the page on your palm, you will notice that won't show the page because it is using ActiveX.
With KMaps (http://www.alealea.com/) it is possible to view Google Maps on your palm / smartphone. Soon it shall be availible for other phones, so the developer decided to use Java technology. This means that you need to have installed "IBM Websphere Environment" (http://www.palm.com/us/support/jvm/download.html).
Now it would be cool to have even Google Earth on your Palm! Google Earth uses much pictures, so it would take much expensive downloading time on your smartphone, but there are Palms with Wireless LAN, too.
So this is the second interesting Java project, after Opera, in this month.