It is suggested that those interested in authoring set up a 'gmail' account, because it automatically has a Blogger account attached to it. Once you have your account, you can contribute by signing in and adding this blog to your blogs.
The system is limiting the number of AUTHORS to 100.
If you just want to comment on the blog entries, you don't have to have Google or Blogger account, you may comment directly on the post.
If you prefer some other web2.0/social site (e.g. Flickr, YouTube, Twitter, etc.) as are more familiar with its using, please, choose that one and be a good blogger, but don't forget to TAG your post with a hashtag too: #eden10 Hashtags.org can aggregate blog posts tagged by #eden10 TAG from any web2.0/social site.