WP Security plugin?

Hi.
I need to ensure my word pressure side and is not very experienced in this field. Do you have a plugin that can help secure my page. I have seen these 10 safety tips but if they were in a plugin would be great
http://www.squidoo.com/wordpress_security

Can you possibly tell whether there is a good plugin somewhere else if WPMUDEV not have a plugin for this purpose.

Best

Tim