How do I share my calendar with friends?

Please see this page.

How do I publish my calendar or have it appear on my blog?

Under Settings > Syndication you will find a lot of options for sharing outside of 30 Boxes. To post a “badge” that lists your upcoming events on your blog you must first choose a View (entire, shared, or custom based on a tag) and then select Javascript/HTML Badge and cut and paste the HTML code into your blog template.

What are some other ways to share with 30 Boxes?

Feel free to circulate your Public Buddy Page. It is a great page to aggregate all of your Web Stuff and share it.  You can also encourage friends to join 30 Boxes and add you as a Buddy.