RE: Objects and such

CustomerObject:
- has a Collection of Address objects
- has a Collection of Phone objects

Yup... :)

Customer c = Customer.GetCustomer(22);
List<Address> customerAddresses = c.GetAddresses();
Foreach(Address a in customerAddresses)
Console.WriteLine(a.Line1);

This would simply get customer 22 from the database for each of his
addresses, print address line one.

And how you expose the Collection is up to you, so if you still want

to have

"GetMailingAddress()" style methods you can.

GetMailingAddress would probably return a single address (the default,
or the one marked as mailing) given its name so you could do this too:

Order o = Order.GetOrder(12343);
Address shipAddress = o.ShipToAddress;
Customer c = o.Customer;
Address customerMailingAddress = c.MailingAddress;
if (shipAddress != customerMailingAddress)
//We're shipping to the non-default address
else
//We're shipping to the default address

-Walden