congrats... as far as the weight issue goes, Spats has it down...
one word of advice i'd give your wife is to relax a little, especially in the first few months... tell her not to beat herself up if she doesn't feel like going to the gym, and to enjoy the time to just daydream about the pregnancy and the baby...
the nine months really does fly by, don't let her waste this precious time worrying about things that in the scheme of life really are insignificant... she has another life inside of her and she should be proud of the weight she'll gain and the changes her body will go through, it really is a miracle... enjoy every second of it...
sorry, i guess my biological clock is ticking again...eeeek...