On Google Wave

On Wednesday Google opened Wave to the public, there is no need for invitations so you can have your friends waving with you which is awesome, however since not too much people is aware of the new service and invitations are not needed how do you invite those who don't have a wave account to wave with you? I would have been nice if Google adds a button to the app so you can send an automated e-mail to a Gmail contact which proper steps to register in Wave so you wouldn't have to manually write an email and send it to all your friends at once, just an idea.