I'm married to an active JW and haven't OFFICIALLY left yet. I want to, but I'm trying to figure out a way to get out and keep my family intact. My wife has given me the ultimatum (?sp) of being a "good" Jehovah's Witness or getting a divorce. So I'm still going to all the meetings. I refuse to go out in service and spread the lies anymore.
I think the key is to take it slow and plant seeds of truth about what the organization really is. Has he ever researched the history of the organization outside of what the Watchtower has to say about it? That is VERY eye opening. They cover up ALOT about their past.
Anyway, I think it is absolutely necessary to keep your relationship strong in all other areas and not let the religion be the main thing you discuss and talk about. If you can ever get him to read Crises of Conscience, that would change everything. I think 80% of JWs that would read that would end up leaving. However, the tricky part is getting them to actually take an honest look at it.