I just really don't think the relationship will last long. I don't know if I would tell him to go around telling people that OW is dating your H. I don't think either of them care if people know. He went to see her and they are posting on myspace about each other. Doesn't seem like they are trying to hide it. If she does pressure him to file...then he might do it. Remeber he is still in that phase where it is new and exciting. He thinks she is making him happy. I just think it will wear off. My T told me that people who think the grass is greener soon learn that that grass has to be mowed and taken care of too.
I DO know how you feel though. I deperatly wanted OW's friends and family to know that she was seeing a married man. The thing is that people who haven't been through it may not think it is so horrible. And they will just say they started dating after you two separated. I just don't really think it will have the reaction you are looking for.
As for the other friend...I hope she is right. Hopefully they did get sick of each other on that trip. Did you think anymore about contacting him?