Decide who should handle the travel details; often, it's the person who is handling fewer of the wedding-related tasks.
Book early to avoid disappointment. Reserve at least six months ahead for the most popular destinations -- Hawaii, Bermuda -- as well as for cruises.
Purchase plane tickets using the name on your passport or driver's license so you won't have a problem with airport security.
Pack a battery charger (and adapter, if needed) for your digital camera, and make sure the memory card is adequate. If it's new, practice taking pictures before you depart.
Take a journal with you to write down your adventures each day.
Bring preprinted labels for postcards, and send some cards to yourselves -- they're fun to receive when you're home.
Get a cell phone that works from the country you're visiting (it's likely yours won't; even if it does, you may spend up to $5 per minute for calls). Vendors sell phones at the arrival areas of most international airports. Or you may wish to rent a phone online before leaving home; two reputable rental companies are www.intouchglobal.com and www.roadpost.com.
Leave a "travel packet" with a relative. It should include your itinerary and contact information in case of an emergency back home, as well as copies of your passport photo pages (if you are traveling overseas) and a list of credit-card numbers to expedite their replacement if lost.