I'm still reluctant to think about marriage too much. I think I would really enjoy it, but since it's a for-life thing (at least it used to be), it's scary to think that you have to make a choice that you hope works out in the long run when it seems like you really don't have enough information to make a good prediction except that you get along well currently.
As for having kids, it's not all that much up to the guy is it? The most you can do is pick someone who also doesn't want kids. And if either of you changes your minds, things get complicated. And like with so many couples, the gall usually wants kids and so the guy doesn't have much choice - have kids with her or get divorced so she can go have kids elsewhere.
I could really go either way. I don't want kids all that much, but if it became a deal breaker I suppose I could change my mind.
@Donkey_Kong: I just feel that people around that age should still be having fun being kids, and that it's too young to be having kids (but then again my folks did the same thing). It's just that at that age, you not only don't know enough about what you want or who you are, much less have any kind of financial backing to support anyone. I get upset at how short the marriages last of people around their 20's, but just the same, there are people who manage to make things work out and for them - not only did they put in a lot of work, but I'm sure they got a lot out of it. I'm reluctant to post this part at all, because I'm so mixed on it - I'm proud of you and don't want to start anything but I certainly don't think it's good advise for most people to jump into parenthood when they haven't finished growing up themselves (heck, I'll probably still be growing up at 28).