We haven't sent any STDs out, our wedding is July 08, we are sending the invites out as soon as I can get other half to sort who is who with regards to names to put on the invitations. I have done all of my side of the family but he needs to tell me his. Soon as that's done, invites are going out.
When we first decided on a date, where and when, we sent an e-mail to everyone we knew to let them know, so I suppose that could have taken the place of STDs, you could try that whilst you are getting your invites ready, to give people as much time as you can.
Valerie