Send all your friends, family members, long lost acquaintances, social network friends and as many people as you can an e-mail or some other message asking them to visit your site, maybe ask them to give a quick review or try something cool, anything interesting, also in the message ask if the person wouldn't mind forwarding this message on to anyone they think might be interested.

This can be done on a recurring basis but dont become annoying otherwise they'll just mark you as spam and you'll never know.