Ancestry.com subscribers now have another way to access their family tree, as the company has released the first beta version of their official Android app. At the moment, it's read only, meaning you can't modify information via the app, and the team has yet to implement many other necessary features such as searching for specific people in your tree.
The official description:
First beta release of the Ancestry app. Please submit feedback to firstname.lastname@example.org.
This is a pre-release product intended for testing only. The ability to add and edit people, search for people in your tree, and more will be available in the final release.