Carnival of the Blue 23 is now posted at Deep Sea News. I contribute regularly to this blog carnival, having hosted twice.
A Blog Carnival is a particular kind of blog community. There are many kinds of blogs, and they contain articles on many kinds of topics. Blog Carnivals typically collect together links pointing to blog articles on a particular topic. A Blog Carnival is like a magazine. It has a title, a topic, editors, contributors, and an audience. Editions of the carnival typically come out on a regular basis (e.g. every monday, or on the first of the month). Each edition is a special blog article that consists of links to all the contributions that have been submitted, often with the editors opinions or remarks.
Carnival of the Blue is published on the first Monday of each month. Topics relate to the ocean and conservation, hence the 'blue.' Next month it is hosted on Sea Notes, the blog of the Monterey Bay Aquarium.