Help me remember the name of a plug-in

I’m trying to find a specific plug-in I remember reading a thread on - of course I didn’t bookmark it and now I can’t find it. What it does is allow you to take a piece of data from a weblog:entries tag and use that data somewhere else on the page, outside of the weblog:entries tag.

I know I read about a plug-in that does this - at least I think it is a plug-in from what it does. Can anyone point me in the right direction? If I had any hair I’d be pulling it out right now!