Try Orchard! is a showcase for the Orchard content management framework: you can try how Orchard feels by checking out an already running demo site where you can play with Orchard as you wish. You can log in to the admin site with the admin/password credentials.
Try Orchard! demo sites are re-installed hourly. There are five demo sites running at the same time and from the above links you can open the freshest (i.e. that was installed most recently) site.