Just a few weeks after the big 3.0 release, Balsamiq published the next update: Balsamiq Mockups 3.1
This version includes a new feature called Alternates, providing a kind of branching mechanism for a single mockup. This can be useful to visualize slightly varying versions, improvement ideas or feedback without changing the original mockup. See the Working with Alternates documentation for details.
In addition, all the features that came with v3 can now be used in the Balsamiq’s Google Drive plugin.
The new release also contains built-in background music (optional), as well as several improvements and bug fixes.