Invitation: Helpful Hints

As i'm getting ready to send out invitations - I've been told a few things can assist with making things easier for me as I get ready to get response cards back.

*Maybe number the back (lightly with pencil) so that way if your guest forgets to fill out the response card, you know who it is from.
*Fill out the M________ part for the guest - some guest don't fill it out
*Have a "we have reserved ____ seat(s) in your honor" to let guests know in instances where not all children or plus one's are allowed
*Double check all your addresses (your guests and your return address)
*Double check the postage - make sure it is correct
*Invitations are usually sent 6-8 weeks before the wedding and Save the Dates are sent 4-6 months prior.
*Have a fresh set of eyes look at it
*For return addresses - what about a stamp or embosser?
*Give yourself plenty of time before the # for caterer is due and the RSVP's are due so you can track down any people who you need to. (I'm giving myself 2 weeks)

What other great invitation advice can you think of?