*Make sure that the ownership is 501.501 or mobile.mobile when copying back (especially if using ssh or sftp as root on the iPhone) otherwise things will break.  Eg. the contacts will be blank even after trying to update due to incorrect ownership/permissions.

iPhone Notes Location/Restore:
/private/var/mobile/Library/AddressBook
AddressBookImages.sqlitedb  AddressBook.sqlitedb

Once you restore the contacts and restart your address book/contacts you'll see that an Apple logo appears and seems to load halfway (progreess bar) and stops, you should be able to view your contacts but you'l have to respring or restart to get of it in the background.  If the contacts don't work, you probably uploaded them with your root account, just chown them to 501.501 or mobile.mobile and they'll work.

iPhone Contacts Location/Restore:
/var/mobile/Library/Notes/
notes.db  notes.idx

On iOS 4 it's notes.sqlite