A few weeks ago I opened my account on Pingg, a site where you have free e-cards and e-invitations that you can personaliza with your own message and designs from a lot of interesting artist.
Plus, you can keep track of everything from the people you sent the invitation to and who has read it and hasn't, send reminders, send complete information...
You can also send paper invitations for a little plus. You write the info, Pingg those everything else. Simple!
For now, I only have a few designs, but I'm woring on some more stuff.
I'll post about it once it's done.
You can find the rest of the designs here.
And there's a banner in the sidebar if you ever want to visit again.