Many people have appointments at addresses which are stored in their Contacts directory. It wopuld be nice to link the address information with the appointment and link that to the event's location in Maps. Ovi Maps on S60 already has the ability to search for properly formatted addresses from Contacts and one would assume the Maemo version will have the same facility.
Discussion thread: http://talk.maemo.org/showthread.php?p=358144