I saw that you mentioned Retrouvaille over on you Solution Journal. It is pretty much all about communication. It is sponsored by the Catholic church, but it is not overly religious, though I guess it might depend a bit on the specific presenters. There was a priest that did some of the presentations, but even then, it wasn't really religious. That said, I wouldn't go so far as to say it's non religious, but I think you would be able to deal with it. I think that while they prefer you don't attend if there is a third party in the marriage, it isn't necessary that both spouses be fully committed, just that they are willing to give it a chance.
We went two years ago. Unfortunately W was pretty tied up in her own stuff (going to school) and was pretty convinced that I as the only one with a problem, so we didn't follow up. I think it could be very useful, though.
