There are a number of WordPress plugins that are designed to pull character data from the WoWArmory, but WoW Character Display is head-and-shoulders above the rest. The main advantage it has is that it caches the armory data, so after its pulled once it only gets refreshed every X minutes, with the administrator able to set the frequency.
Most of the other WoWArmory-related plugins essentially pull in the data fresh each time a page featuring the character or guild is displayed, which is less than ideal. Since the WoWArmory data itself changes infrequently (it is usually updated sortly after you log out of WoW), reloading it for every page load is unnecessary.
I’ve got the plugin activated on this page and you can see my main toon here.