I'll echo that a lot of the above (silly Italians and Aussies aside

). I've been married for 20 years, and we're a very atypical couple. She's more the husband and I'm more the wife in all this. We're both Geeks and long term gamers. I'm the Picard fan, she prefers Kirk. I'm the narrator, she's the Hack and Slasher. She's also makeup-free and farm stock butch a lot of the time, coming from a similar incredible Pennsylvania Dutch family of strong women.
From our perspective, here's a few things I can spotlight:
- Sex. Once a month is OK. But foreplay is essential. Consider a week without sex OK, but only if it includes making out and heavy petting.

Sex every day or more often is fine too, if schedule and health permit. There's no too much, and no too little if intamacy is maintained. Your honeymoon really never does have to end. Two decades with two teenaged kids here, and we still disgust them in public by holding hands, giggling, and sneaking kisses.
- Money. In our case, we've always had just one income. No three-checkbook system. Purchases are discussed openly, and decided upon together. The budget and bills are done as a couples activity.
- Personal Space and fights. The best advice: Get over it, after a bit. Make sure there's a place you retreat to with nothing he needs, and vice versa. Spell this out in advance. She goes to the bedroom when she's angry and reads or watches cable. She closes the door. When its open, we can talk. I stay here at my computer.
You don't have to be angry to be apart, just agree on a code word. "I'm going to be in my room" is a good one for her. If she says that, she just wants some quiet time, and I stay here. (The bedroom may not work if you keep up the laundry instead of having sort of folded bins of it by the couch like us.

)
- Personal Interests. She's into reading romance novels with country music on. I'm into First-person shooters with some fairly hard metal on. We do not share these hobbies. Two pairs of headphones and we're ten feet from each other, enjoying our seperate hobbies together.
- Shared interests. You probably have this one down, since you ended up married. Take part of every day to do your things together. Even if its one TV show, or reading each other shared articles of common interest from your computers. Ours include those, as well as shopping, even without spending anything.
- In the end, all the marriages I've known that went as long as ours and longer seem to follow a recipie of one part best friend, one part lover, and never forgetting why you fell in love in the first place. If you can look at him every morning and always feel like you're seeing him for the first time again, if every kiss still has a small spark, you've got it.
Edit: An important one I let slip in the typing frenzy...
Rituals! Find something that you've done three or four times and that brings a smile. Make it a ritual. Assign the importance of ritual to it when you do it. If you don't do it on occasion, and this is important,
realize you forgot to do it, and
let yourself feel as happy and warm as if you had beacuse you usually do. We have dozens of tiny little meaningless rituals we do. They bring us closer together, even when we remember we forgot to do them.