How is it different from Tungle’s sharing feature?
Sharing calendars with someone means you can both see each other’s calendars. You can also choose to share full details or free/busy. Sharing between calendars requires you both to be Tungle users. Tungle.me is a link that enables only you to share, and share only your free/busy calendar via a special URL. You can share this with anyone who has access to the web. They don’t have to be Tungle users to access the link, and they don’t have to sign up to send you meeting invitations.