At my own wedding in September, my wife and I decided to make it an adults only affair.  I'm seeing this at more and more weddings.  We were worried that our guests who were parents would be upset...in fact it, was exactly the opposite.  Everyone LOVED the idea and treated it like a romantic date night away from the kids.  It allowed them to let loose and enjoy themselves without having to worry about the kids.  Now, if you do decide to have no kids at your wedding I'd advise you try and secure some sort of child care for them at or near the event to try and make it easier for parents...but that's totally up to you.