I will admit that I am an alcholic also and can see that your husband is showing all the basic signs of it. It's often hard to see drinking as a problem when your not really becoming aggressive or doing anything stupid, but it still IS a problem. I have been an on again and off again alcholic for about 10 years now, in that time I have tried rehab and the blue book and it just didn't work. Here are some things that did work for me. To me (and this DOES NOT work for everyone, not drinking was not the answer).
1) Ask him to make sure he is not drinking for emotional reasons. I view social and responsible drinking as okay, but if i'm picking up the bottle when I'm upset I know the problem is coming back.
2) Refrain from drinking during certain periods. Since I have a normal 9-5 job 5 days a week, I do not drink on any day that I have to work the following day. This limits my amount of drinking and in your case would verify that he is available to you the majority of the time.
3) Don't drink heavily when the kids are awake. One beer right before bed time might be fine, but it's usually better to keep drinking limited until the kids are in bed for the night. This makes it clear that until they are in bed, his time belongs to his family, after that he can relax and unwind with a beer if he so desires.
Like I stated, these are not the ways that most people would suggest dealing with this situation, but they are some ideas. If he puts them into affect, he might start noticing the differences in his behavior along with seeing what he is neglecting you during and what fun he could be having with the children. This may be the incentive to lead to a stronger form of treatment.
J.