I love Google maps and virtual earth. But they have a limitation of only showing maps of US, Canada and a few European countries (for now atleast). But I just stumbled across Microsoft Research India. Finally the map of India is online using Virtual earth technology. Take a look:
http://virtualindia.msresearch.in/
It would be cool to develop a mash up of your travel itenary that your travel agent provides with a detailed map from Virtual earth. Soon, very soon.. I can almost see how it is going to work.