Wordpress Info Tooltips allows you easily add any additional info to any word of your posts.
After trying this plugin out on their tester website, it seemed like everything was ok. However, when I installed it to my own website (after having to dink around with the .zip to make it install) the plugin doesn't work the same on my website as it did on the tester site. It doesn't look like this plugin is being supported anymore, so I would suggest giving it a pass. Too bad too, if it had done what it showed on the tester site, I might have bought it.
You can get the same for free. Take a look at the plugins depot.
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