cancun mark:
mbeerski
I am sure as a DM that you have evaluated your wifes motives, and the concern of some of the other posters about her feeling pressured is not a problem, so go for it, encourage her, but dont crowd her on it.
Help her find someone you both feel comfortable, but then stay out of the way as the instructor does his/her job. There is nothing worse for an instructor or a student than having an "extra" instructor getting in the way, no matter how good their motives are.
Good luck with the search tho, I have a friend from Toronto that teaches, but I think she is working in vancouver, I will send her a message and see what I can find out.
I agree with cancun mark, to the point that it's futile to try to push your passion onto someone, who might go along out of "spousely loyality" or some such thing.
However reluctance to take up an activity may have many sources -- one being simply fear of the unknown, or reluctance to enter (and possibly slow down) a spouses activities.
mbeerski, I am sure that you as a DM have evaluated this in her, and that your evaluation is that she has no fundamental "issues" which would exclude her from this activity. And she's agreed to try, which is great!
My advice mirrors cancun mark's, in that you should use your training, experience and professionalism in finding an instructor for her, who you both trust and feel comfortable with -- and then let him do his job. It might be a good idea to opt for individual lessons for her, so that she has the undivided attention of the instructor -- and you can offer (to the instructor) to be in the water with her WITHOUT INTERFERING (take your DM-cap off and think of yourself as an OW diver for this purpose). You know, just as a moral backup -- but also so that she has you to share her joy with when she discovers the wonder of the underwater world. The instructor may be more willing to let you do this with individual lessons than if he has a group of divers with him. Pratice your horizontal hover, but otherwise do nothing while watching them, least you will be a distraction.
After she's tried it, I'd suggest to not push the issue much further: if she wants to join you when you go diving, that's just great -- but she's already made an effort in trying it out for your sake. If she doesn't like it, asking more of her is just unfair.
And also, I second the suggestion of a warm-water-experience/vacation -- if you're already reluctant, a dive in a murky quarry, where you're freezing your rear off and seeing only the tail of a fleeing pike, might not be fun and inspireing for future diving. Mucking around in 8m of bright blue, warm, water with plenty of critters and curious finned friends is, on the other hand, something which is attractive to almost everyone.
Let's know how it works out