Get rid of anything you aren't bringing with you.
Find out where to dispose of household chemicals like old paint. Make a list of everything you're bringing to your new home.
Find out the replacement value of all belongings, for insurance purposes.
Fill out a change of address form.
Notify friends, family and others of your new address.
Fill out an IRS change of address form.
Get copies of your medical and dental records, if necessary.
Get copies of veterinary records, if necessary.
If you're moving out of state, find out about auto licensing and insurance.
If you're moving in-state, find out where and how to change your address on your driver's license.
Notify your kids schools and have their records transferred to their new schools.
Return any cable equipment.
Make hotel and airline reservations if you need them.