NOTE: This took this idea and improved it.
This is the page for the Wp-Wikipedia-Excerpt plugin. At the moment it turns [wikipedia]c++[/wikipedia] into c++. The plan is to extend it to also have a hover-over containing an excerpt from the wikipedia entry.
To use download wp-wikipedia-excerptphp.zip an unzip it into the wikipedia wp-content/plugins directory and then activate from the wordpress plugins page.
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