Kibitzing is something that has come up in our group occasionally. Okay that's a lie. It comes up about once a session at my real life game. It seems to be associated to 4e. Or to real life. I haven't seen it show up in 3.5 or in online games. There is "I'm going to be gone, play my character for me" but none of the kibitzing.
Art from GIS for "chess moving pieces"