A Simple Every Day Thing

I don't think it should be a "service" item.....

flash him a boob & he'll be happy! (omg, I can't believe I typed that!)

What a great question! I used to leave notes in his lunch every day, I should get back to doing that. Thanks for the post, I look forward to hearing what ideas others have!

Help with part of his morning routine-if he drinks coffee, have it made when he gets up (you could do this with breakfast, making his lunch, etc.) Or, you could "help" in his nightly routine, too-back or foot rubs, get him a fresh towel for when he gets out of the shower. Just pay close attention to his routine, and look at what things you could do special for him.
I sometimes like to leave little, short love notes in each of my husband's pairs of pants for work, when I do the laundry. I just slip one in each of the pockets, it's a nice little surprise.

I do the laundry, clean the kitchen, keep the children, make the beds... etc. The list goes on. Everything I do for the family, I do for him. I have to say that my husband loves coming home to a clean kitchen with clear counters -- so he can drop all of his stuff there and make a mess... ;-)
Once in a while, if I'm out shopping and I come across his favorite chocolate, I purchase it and leave it on his keyboard. He loves that!
Sometimes I take out the trash. Sometimes I work in the yard - which he knows I absolutely hate. Sometimes I do something extra around the house that I know he won't have time to do... It's the little things - the little surprises that make my husband happy.
YMMV
LBC

I agree with both of the Mama's that have answered below...
A: You already do a lot of "nice things" for your husband and your family...if you as a SAHM you are keeping a nice home for him, preparing his meals, doing his laundry...etc etc
B: I understand that you want to do something that is JUST for him...
Does he take his lunch to work? Put a little note in with his sandwich telling him that you love him...or something special that you appreciate about him
Call his cell phone ( at a time that you know he can't answer it) and leave a short message just reminding him that he is special to you.
Does he have a special treat that he just LOVES...slip that into his lunch box his brief case, his pocket
I don't know how old your children are...if they are old enough get them in on the act...let them tell you what they love about their Daddy and write that in a note...or have them write something special for him
Think of what you would like for HIM to do for you...and try modeling something after that for him...just let your heart guide you...he will love it all!!!

I try to do things like make sure the coffee pot is set so he has coffee when he wakes up, or leave notes in his bag or scrape his car if it snows. What kinds of little things does your man like and what would make him feel loved?

I put little notes in my guys lunch, or write him a note in lipstick on the bathroom mirror. We don't have cell phones so we don't get to talk much during the day. I also sometimes leave a note in his lunch telling him to look in the glovebox of his car, and sometimes leave a little 'happy' in there... a magazine to read on his break, some gummy worms (his fav), underwear, whatever ;)

Make a meal or dessert you know he loves, put a special treat in his lunch, wake up early to make him breakfast, surprise him with a lunch date at work...

Sometimes I go to my parents with the kids for a few days, they live almost 2 hours away, and my husband gets the house to himself. He loves to just be home alone sometimes. Must be nice huh?