I have uploaded a demo of Timesheet Next Gen using the 1.3.1 release found within the SVN.

To view the demo go to
http://demo.timesheetng.org
user: admin
pass: password

Play around as much as you like. I have it resetting itself every hour.

If you want to get hold of the 1.3.1 release, you can get it from our SVN repository, see the downloads page for more info