Is someone going to check on your home? Do they have a key?
Who's going to take care of your pet(s)?
Did you remove perishables from the refigerator?
Take out trash?
Are your bills paid that will be due while you are gone?
Turn down heat/air?
Doors and windows locked?
Time to get ready; some more thoughts to remember:
Travel documents and copies if needed?
Check your luggage for any needed repairs before your trip and check again for damage immediately after your flight. Make airline damage claims on the spot.
Keep valuables such as jewelry, keys or gifts plus medications in your carry-on luggage.
Travel with toiletries and a change of clothes in your carry-on just in case your bags don't arrive at the same time as you.
Create a "personal packing checklist" to avoid leaving anything behind. Your list could also come in handy if your bags are lost.
Leave a copy of your travel itinerary, hotel address and telephone number, etc. with a friend or family member.
Tie something bright or unique to your luggage to spot it quickly in the airport, AND to prevent someone else from accidentally picking up your bag.
Keep an extra photocopy of your passport in a safe place when traveling abroad.
Check with your airline for their specific guidelines to find out the number, size of bags, and weight you are allowed to check and to carry on.
Pack in as small a bag as possible. Compression Bags eliminate air trapped in clothing saving space with items like sweaters or a pillow.
Find out what electrical adapters and converters you will need when traveling abroad. (See above Electric guide)
Did you remember all you chargers (phone, camera, computer, etc)?
Pick up a business card, pack of matches or a brochure at the front desk of the hotel to keep with you at all times when traveling abroad. You may find yourself in a situation where it is difficult to communicate, in a taxi for example, and need to provide the address to return you to your lodging.
Reduce jet lag by drinking lots of water (not juice, soft drinks, etc.) before, during and after your flight.
It's nice to pack a nightlight ~ it can be difficult to get around in a strange place in the middle of the night.