How to center a div, image, text are mainstream topics on the web without question these days, but find a nice tutorial/post that explains how to do that is no so common, well, not any more!. I came across with an excellent post on smashing magazine, called Absolute Horizontal And Vertical Centering In CSS that does that in a very easy way!. Kudos to Stephen Shaw.
Inside this post you will find a link to another excellent post: How to Center Anything With CSS by Joshua Johnson. and most important, both articles cover various common scenarios, so, what are waiting for!? xD
Hope you find this information useful!