Be a participant in the monthly Agatha Christie Challenge Blog Carnival which is published 22-23 of each month. It is an opportunity to submit your Agatha Christie reviews and updates to each carnival. So when you write a review or an update about your progress in the challenge, then the next step each time is to submit your post to the Carnival here .
The carnival has various categories:
Tommy & Tuppence
Discoveries (here you can submit interesting Agatha Christie related websites that you've discovered)