cj2011 wrote:so do you think it is best to not bother with the rsvp cards or the stamps on all the envelopes and just put on an email to respond to or a phone number rsvp? I dont want to waste my money! I have set up a "wedding only" email address for us so that I can keep track of all rsvp

Good question. I liked the formality of paper RSVPs, so that is why I chose that. I also loved getting home and looking in the letterbox to see if any little envelopes had arrived. I would imagine that logistically email/phone would be easier and of course cheaper. And thats also very common. My cousin has actually set up a website for her RSVPs, so you go online and fill in your name and say if you can come or not, which is kinda cool (still waiting for the website to go live so I can see the finished product).
So really it depends if you want paper RSVPs...but I would say that if you are doing paper ones, go the whole way and add envelopes and stamps and addresses, anything to make it easier for people and encourage them to do it. If people have to find an envelope, a stamp, write and address, then they will be less likely to return it.