The user login block is one of the most common blocks on any Drupal site. It might be in this region, or that region, or this header, footer, or block... the idea of this post is that it is that you, at some point, you will probably want to theme it... and maybe you'll use this post to help you through. I have spent part to the day working with a flexible way to make the user login block a little cooler. Specifically, I wanted it horizontal, and I wanted to change some of the values, and finally some css to finish it off... and eventually some jQuery if I can find the time.