Day Before

Completed Task Arrange for someone to drop off the guest book and pen at the reception site.
Completed Task Have fun at your rehearsal dinner (and try to relax!)
Give wedding announcements to your honor attendant to be mailed on the wedding day.
 
Confirm all honeymoon travel plans (including transportation to airport, etc.).
Completed Task Get much-needed pampering and sleep — if you can!
Completed Task Pull together a last-minute emergency kit (aspirin, makeup, safety pins, mints, etc.). Also make sure you have everything together — your wedding gown, veil, shoes, and stockings.
If your wedding is in the a.m., set your alarm and arrange for a backup.
Completed Task Rehearse the ceremony with your officiant and wedding party.