If you send a wedding invitation to the President, you will receive a congratulatory letter from him and the First Lady. I don't care who the president will be when I get married, I have to remember to do this!
Hand-Canceling - Remember to do this! Take invitations to the post office and request Hand-cancelling so you don't get ugly bar-codes printed on your invitations. I didn't even know that was an option...also has other advice for invitations
The day he asked you out, the day he proposed, and the day you two got married. Such a cute idea! Id include the day you first met and change stole his last name to took (hate using the same word twice, way to make available words for that)