So you went to all that trouble to create a wedding website, uploaded photos, maps, write cute stories about how you met and about your wedding party — are you supposed to just let it turn into Internet dust? I'm sure you've thought to post your honeymoon photos on the site after the party, but have you thought about buying your domain (try GoDaddy) and then transferring your stuff into a blog?
Keep your family updated on your married life (but not too updated, you don't want to TMI Aunt Martha), and then, if you start a family, keep everyone abreast of that, too!
If you decide to buy your domain, and keep a blog about your new life (or simply photos), you could include a small card telling your guests as such in thank-you cards.
Why should just engaged couples have all the fun?