I use WordPress and think it's very good. I would suggest only one little change, i think it would be nice to display some information to the user after he sends the first post. That's because this post is not displayed on the page with messages and no information is given to the user that his post must be approved by the site administrator. Thus this situation could cause that the user keeps trying to add the messages and after approving by admin multiple posts are visible on the page.
The whole thing is marginal but that's the only thing which i would change else it's fantastic.