Okay so nothing special then. I thought it looked like somehting I'm looking at is creating the tag popups like Wikipedia, and other sites. I think they automatically identify the keywords in a meta tag then with JS they apply the tag and hint popup. "Ajax tooltip"
It's slow going and I may need help and other ideas.
I have popup hints on a couple of sites but they don't go out and grab content, you have to put it in yourself. Ajax Tooltip uses javascript, but I'm sure it can be done with php.
I was actually thinking about making a simple plugin that creates those links automatically from, say [wikipedia:Geeklog], but I just don't have the time. Should be fairly easy.
I would help but I don't quite understand how it works myself. I was able to create a link hint/tip/alt or what ever you want to call it with javascript that pulls in a page. Okay that's not correct, I found scripts and modified them. I'm still messing with it and to say the least for someone who doesn't know what he's doing I think I'm doing pretty well.