Often when I set up a new customer on my MYOB system, there is address data missing. Quite often the postcode needs to be looked up and I either have to go to the Australia Post website or call the customer for full address details.
Most modern systems allow a cascading dropdown list as you type the city or suburb, allowing you to select the appropriate record and pre-populate the remaining address fields.
A further enhancement would be to then link to a Google map to the card address so that when you need to go on a site visit you already have the directions.
I guess this is not on a high priority wish list but this functionality would greatly enhance data integrity and improve workflow.
"Address validation on cards"