Pulse deserves a place of honour on your home screen for one reason: it aggregates the web. The idea is to showing top stories from around the web, but each one shows a quick thumbnail. When you click, you can read just the basic story and view photos without the usual clutter. It's also easy to share links.
2. Google Earth
Google Earth is free, like most Google apps, but worth the download on the Xoom because of how quickly it works on the Tegra processor. In our tests, zooming into a London street corner, the app worked smoother than anything we've seen on the iPad for mapping software. You can plan routes as well, see topographical info, and search for landmarks all over the world.
3. Google Sky Map
One of those rare apps that makes people gasp when they first use it, Sky Map shows star constellations in real-time as you move your tablet around the night sky. You can zoom in and choose to hide some objects, such as planets, to make it easier to find what you want.
4. Google Body
Google Body lives up to the Google mission statement: you can find anything, even your femur. The interface for looking at the human body is very intuitive - you can zoom in on any body part, view just a skeleton or muscles, and search for body parts, muscles, bones, or just about any part of our anatomy.
When we picked the top Android apps many eons ago, Kindle was a top contender. On Android 3.0, it is less compelling, since the Google Books app works quite well. However, any books you have previously purchased from the Kindle Store appear here automatically.