I use ½ cup ramekins to set my panna cotta in, but if you don't have any, this dessert is pretty served in tea cups as well. You can unmould the panna cotta onto serving plates, or simply serve it in the ramekins/cups topped with some syrup.
To unmould the panna cotta once set, allow it to sit at room temperature for 10 minutes, or set it in a dish of warm water for a few minutes to loosen the sides. Gently turn the ramekin on its side and roll the ramekin in your hand, letting gravity gently work the panna cotta away from the sides of the ramekin. Put the ramekin on the bench, and place the serving plate upside down on top of the ramekin. Quickly turn both over so the ramekin is now upside down on the serving plate. The panna cotta should slip out, but if it doesn't, hold both the plate and ramekin between your hands and give them a firm but gentle shake to cause the panna cotta to drop on to the plate.