Unfortunately, the Apture plugin doesn't appear to work - At least with Hybrid News. I reverted back to Wordpress Default to test it and it worked with that theme.
The plugin can be found at http://wordpress.org/extend/plugins/apture/
When I used it in Wordpress default, I get a link to Wikipedia with an icon like on the Apture website http://www.apture.com/
When I used with Hybrid News, I get a space after the "highlighted" text (the icon should be before) and there is no link. Looking at the html, it shows:
[a id="aptureLink_pMadHfdrP7ffasdfzR3Yb" href="http://en.wikipedia.org/wiki/Reverse%20Proxy"]mytext[/a]
Update: I forgot to mention that to work, the plugin adds to footer.php ?php function_exists('apture_script') && apture_script(); ?
Also, upon installation, you have the option of having it look through existing posts and adding popups for links to services they partner with (e.g. Wikipedia). That worked successfully in Hybrid News as my previous posts with links to wikipedia are showing up with Apture's icon and a popup to the Wikipedia page associated with that link.
Update Update:OK, strange behavior. It works if I put the post in the same category as my sticky posts used for the front page (cat=3), but if I put it in any other category - I only have two others and only one has a post in it - it doesn't work. By doesn't work I mean the anchor tag is missing altogether (I looked at source).
Right now, I'm just using it in the proper category to get by. I'll try to think of what could be wrong based on categories later.