Wp-Wikipedia-Excerpt
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This plugin replaces [wikipedia]topic[/wikipedia] with a wikipedia search link for that term.
The basic idea here is that you can easily link to the wikipedia entry for a given topic by putting the [wikipedia]topic[/wikipedia] tag into your post. The tag is replaced by a link that executes the wikipedia search form for that topic.
The plan is to augment this with a mouseover popup containing an excerpt from the wikipedia page.
This plugin is available for download for your site.