Other than wedding, our biggest areas where we are overbudget seem to be groceries and dining out. I've started changing my eating out habits, so hopefully that will help. I'm not sure how to spend less on groceries; my current thinking is to try to track grocery spending more precisely, but I'm not sure if I'm up to keeping such detailed track.
My biggest breakthrough in budgeting was something that happened a few weeks ago, when I started making long-term plans. I realized that what matters is not how much you earn, or how much you spend, but the difference between the two. (And, most importantly, the sign of it.) This means that amounts that seem inconsequential when compared to our household income can still have a significant impact on our financial well-being. I stopped buying lattes after I figured this out!