A demo installation is available for testing out Timesheet Next Gen.

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.

It is based on the V1.5.0 release found within the SVN. If you want to get hold of a copy of Timesheet Next Gen, see the downloads page for more info