Well then I owe you a better explanation. If you haven't used Google Wave before I should first state that there is a search box in the center window. Simply by typing in with:public it searches all public waves and displays them. Then you can scan through waves of interest and join in where you like.

Additionally you can add extra qualifiers like with:public HackerNews and get waves like the HackerNews wave.

Nothing Earth shattering yet, but there is definitely some potential for people connecting which is always fun (at least for me) as well as building tools (robots) for automagic wave processing.