Completely agree lwb. Not sure if it will work but try to get the point across to your H that you have zero interest in what is going on in OW's life (including crap she continues to do to her own H). Hopefully this will keep him from trying to drag you into future incidents.
About this latest mess though, I'm not sure what you should do. Your H is being spiteful, hurtful and completely unaware/uncaring of what he continues to do to LWB (no surprises there I'm afraid).
I don't think it's your job to keep OW's H informed on what she is doing. You have taken on so much crap in this mess. My suggestion is that you simply let it go. You need to focus on your life, your own problems. You cannot be the St. Louis marriage lifeguard anymore.
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Me: 39/W: 37 D13-D11-S8 M/T 14/20
EA confirmed: 9/13/07 D-Bomb: 9/19/07 OM Gone since 12/18/07 W wants to fix marriage: 3/16/07