A "submit an article/post" plugin?

My client wants our users/members to be able to submit an article on our site.

I’d love to be able to, on the front end (like, in a “Submit An Article” page), enter in an article title and body. Then it would be sent to me for moderation. I’d like the ability to have all post submissions have a particular category that I pick (i.e. “Articles”:wink:.