Hey wordpressers, So I'm writing my first plugin and seem to have hit a wall. I would love to use the add_post_meta function to create meta for a new post. This function's first argument is the post_id though. Now, how can I get the post ID if the post has yet to be created? I have a section created underneath the content area, and I would like to process it via AJAX like the Custom Fields area, but without the Post ID, I'm stuck. How does the Custom Fields area get the post ID for a post that hasn't yet been created?