Custom Field Hacks For WordPress
Custom fields are a great little thing. They allow you to easily customize your blog with only a little bit of code. Below is a succinct explanation on how to do it, courtesy wprecipes.com
Open your single.php file (You can also modify your index.php file) and paste the following code anywhere within the loop:
$customField = get_post_custom_values("mood"); if (isset($customField[0])) { echo "Mood: ".$customField[0];Save the file. Now when you’ll write a new post, just create a custom field named mood and type your current mood as a value.