conversationlist

"A conversationlist is your attention transformed into a tweetstream. To be a little more specific, a "conversationlist" is a #Twitter list of the people that you talk to (and about) on Twitter. The list is automatically updated daily, so that it always reflects the people that you are paying attention to right now. If you @reply (or @mention) someone, they're added to your list. If you stop talking to that person, they drop off your list"