What is your favorite online invitation service?

Another vote for paperlesspost.

I agree with NWB. I love paperless post. They simply have the nicest, most elegant designs.

www.evite.com.. They even have a reasonably wide selection of free invites.

I love the Paperless Post. http://www.paperlesspost.com/

Really cute invitations that are fun and classy. It isn't free, but I think the price is worth not having ads all over the invitation. I think they also have a pretty generous introductory offer that includes a bunch of free invites.