yContributors easily creates pretty, jQuery-searchable contributor/author indices and author and contributor archives.
Remember, [for now] yContributors doesn't do anything to your profiles, it just displays them in a cool way to the outer world. We like two great WP plugins that work with yContributors, User Photo (http://wordpress.org/extend/plugins/user-photo/) and Rich Text Biography (http://wordpress.org/extend/plugins/rich-text-biography/) that should help you.
Certainly. CSS is your best friend. everything is id'd and class'd.
That's because you haven't excluded users with 0 posts. Go to the back end and make sure to check the boxes next to the names of anyone with 0 posts.
See above question on 0 posts, but also you'll probably need to style it. I purposefully left it sparsely styled so you can use your stylesheet. Try the table format to see if it works better for you, or please be in touch with us for customization.
Remember that to style an individual author's post list, you must code your own wp template called authors.php.