Option to not log chat (XEP-136)
those are Gtalk official client only. I don't think they will be pushing any docs soon on how things are done, so we need to see xml console of Gtalk (or if doesn't have use ethereal) to find out how they do things described in http://mail.google.com/support/bin/topic.py?topic=8405
most thing we would like to have atm is:
Toggle OFF THE RECORD in roster item (this is persistent setting about logging or not chats with this contact)