Fun for Kids
I always think it is so neat when a couple provides some sort of entertainment for their littlest guests. There is one major wedding consulting business in town that provides all sorts of services for kids - from babysitting to fun games. I think they even have tea parties!
Also, some DJs offer Playstation or Wii game consoles for the kids. Very fun! And from the parent perspective, it is very cool that I don't have to worry about entertaining my kid when trying to socialize with my friends.