Google announced Google Maps for Mobile 2.2 which adds bus and train information. However, it is not available for Windows Mobile devices yet. If you try to download it on a Windows Mobile device, you will get version 2.1. The blog item announcing 2.2 says that it is available for the Blackberry and many Java-based phones.
If we Windows Mobile users feel left out now, just wait until next week when the geeksphere is abuzz over all things iPhone which will also NOT work with Windows Mobile smartphones. Sigh.