I recently joined Blog Carnival and found it to be both fun and useful as a newcomer to blogging. Blog Carnival finds really good blog posts on a given topic, and then puts all those posts together in a topical blog post called a "carnival". If you are a blogger you can submit your posts on a regular basis for inclusion into a carnival. It's a no-brainer if you want to drive new traffic to your site and extend your reach. Non-bloggers can enjoy this site too finding great targeted reading in a one-stop-shop without any sign up required.