Hi Caveman
I think it's a really good idea you asking this question - as you say, nice to get opinions from strangers sometimes. I'd say take heed of some of the suggestions already made here and also talk to your wife, but in a way that doesn't, as you said, make her feel like she's having to do the work.
For what it's worth, these are the sorts of things I tend to do. It looks like a job list written this way, but it's not like that really, it's just part of being in love with someone and wanting them to feel happy and appreciated.
Share the housework - it's a job for both people in a couple, as someone else mentioned, it's not just 'helping around the house', it's a partnership!
Plan, buy for and cook meals. Not just for special occasions, but all the time
Tell you you love her.
Play a full role as a dad. Some men are stupid enough to refer to time spent looking after the kids when their partner is out as 'babysitting'. Completely wrong - they're your kids. I'm sure you're not like that, though.
Support her in everything she does.
Flowers! Cliched but important. Randomly, whenever you feel the urge, not just occasions like birthdays or anniversaries. Out shopping by yourself? Drop by the florist sometimes while you're at it and surprise her when you get home.
Take her out and about whenever you get the chance to be alone.
Massages without expecting sex or even a massage in return.
Get up in the morning with our son so she can have a lie in.
Bath and put our son to bed to give her time for herself in the evening.
Someone upthread mentioned physical affection and stroking - some people aren't really into that, so it depends what she likes.
Oh there are lots of things you can do. Make sure she's always in your thoughts and all the ways you can make her smile will be right there.