Well I'm the Apple-junkie of the house, and I've slowly brought around my boyfriend to be one too. I was able to convert my boyfriend to a Mac back when we were dating long-distance, as I convinced him iChat was the best way for us to communicate (and it was!).
When the iPhone came out, I was obsessed with getting one -- but couldn't afford it for many months. I got really depressed about it (sad, I know -- but it just didn't feel "right" not having one, while so many of my buddies -- even ones who didn't own macs -- were getting them). My boyfriend was determined to get me one, as he knew how much it meant to me -- but we were living together by then, and both struggling with money. I was finally able to get one from an Apple Gift Card I got, and all was good with the world.
But after a while, I could tell my boyfriend was getting insanely jealous of my iPhone. I promised him we'd work on getting him one too eventually, but I think he mostly hated how much time I spent on it. Every time he tried it out himself, though, he had something to complain about it. It was always way too slow, or the keyboard drove him nuts. I was wondering if an iPhone would really be a good fit for him or not.
Then the iPhone 3G was announced, with its affordable price, and I knew the 3G speeds would make my boyfriend turn around (and the keyboard just needed getting used to). When I talked about the idea of him getting one, he seemed excited about it -- but he thought that *I* should get the 3G phone, since I was the major Apple-junkie of the house, and then he would just get my 1st gen phone. But I knew he would never be able to deal with EDGE speeds (which I didn't mind). And also...I secretly wanted to keep my chrome-backed phone anyway, since I preferred the look. When his birthday came around, just shortly after the 3G's launch, I surprised him with a new 3G -- and he repeatedly says it's the best gift he's ever gotten.
Now he's even more addicted to the phone than even I was, and now it's ME who's jealous! He pulls that damn thing out every chance he gets, and it looks like I've created an iPhone monster!!
But it's ok -- I wouldn't have it any other way. It just "feels right" with us both using Macs and iPhones. And now I don't feel so guilty when I'm playing with my phone, since he's usually playing with his first.