WordPress shortcodes are very powerful but still unknown to many. It can do more out of the usual, therefore, make blogging a lot easier. Shortcodes are very easy to use. If you don’t know anything about shortcodes yet, I suggest you learn the basics of shortcodes and learn why you need to use it.
Using shortcodes is very easy, just switch to HTML mode and type in the shortcode.
For example, you can use shortcodes to embed content like this:
What is great about shortcodes is that they are very easy to create. If you know how to write a basic PHP function, then you already know how to create your own WordPress ShortCode.
Read the rest of the post here: http://wp.smashingmagazine.com/2009/02/02/mastering-wordpress-shortcodes/