Hi Becky,

I am a web developer, and one of my web applications is WhosComing.com, an online rsvp system. Although I am a Mac user, developed it on the Mac, and served it on a Mac webserver for the first few years, it is platform independent, so any computer can use it. It lets people sign up online, and you can can do a lot as an admin. Also, you can let the guests see who else is coming. It's tailor made for business-type meetings and events (i.e. not so much for weddings).

Terry Wilson