Are you a fan of evite?
Then you will love Pingg, and then some! Pingg allows you to create online invitations, but the beauty all lies in the delivery. Using what they call "Surroundsend" you can be sure your invitation gets out. Delivery by Email, text, Print/Mail, Personalized Web Page and Social Networks such as facebook and twitter will certainly get the message out. They have some pretty funky designs too.