Perhaps the most arduous task of wedding planning is deciding on a budget, which determines how many people you can invite to your ceremony and reception. Help your fiancée make a wedding guest list; if you're familiar with Microsoft Excel, this is the time to flex your skills. Use spreadsheets to keep track of guests' names, addresses, responses and wedding gifts.
And speaking of wedding gifts, score major points with your future wife by offering to help her write thank-you notes. It's a daunting chore, but splitting the job in half makes it easier to conquer.