Hi Gilles/Allan/all previous authors,
First of all thanks for everything. Here are some changes marked wityh //fred001 to be able to use the DNN profile in the store. Please test and let me know how it works for you:
Regards,
Fred

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C:\DotNetNuke_2\Website\DesktopModules\WWStore\Providers\AddressProviders\DefaultAddressProvider\DefaultAddressCheckout.ascx.cs

Line108+

                lstBillAddress.Items.Insert(0, new ListItem(Localization.GetString("SelectBillingAddress", this.LocalResourceFile), "-1"));
                lstBillAddress.ClearSelection(); //fred001
                lstBillAddress.Items[1].Selected = true; //fred001
                lstBillAddress_SelectedIndexChanged(lstBillAddress, new EventArgs()); //fred001

                lstShipAddress.DataSource = addresses;
                lstShipAddress.DataTextField = "Description";
                lstShipAddress.DataValueField = "AddressID";
                lstShipAddress.DataBind();
                lstShipAddress.Items.Insert(0, new ListItem(Localization.GetString("SelectShippingAddress", this.LocalResourceFile), "-1"));
                populateShipAddress(int.Parse(lstBillAddress.SelectedValue)); //fred001
                //ShippingAddressSelectionEnabled = false;

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C:\DotNetNuke_2\Website\DesktopModules\WWStore\Providers\AddressProviders\DefaultAddressProvider\StoreAddress.ascx.cs

Line346+

  public void PopulateAddress()
  {
   if (_AddressInfo != null)
   {
    if (_CountryData.ToLower() == "text")
    {
     if (_AddressInfo.CountryCode == "")
     {
      cboCountry.SelectedIndex = 0;
     }
     else
     {
                        if (cboCountry.Items.Count == 0) //fred001
                        {
                            loadCountryList(); //fred001
                        }
                        if (!(cboCountry.Items.FindByText(_AddressInfo.CountryCode) == null))
                        {
                            cboCountry.ClearSelection();
                            cboCountry.Items.FindByText(_AddressInfo.CountryCode).Selected = true;
                        }

Line526+

     short tabIndex = (short)_StartTabIndex;
     foreach (System.Web.UI.WebControls.WebControl control in inputControls)
     {
      control.TabIndex = tabIndex++;
     }

                    if (cboCountry.Items.Count == 0) //fred001
                    {
                        loadCountryList(); //fred001
                    }

     //PopulateAddress();

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C:\DotNetNuke_2\Website\DesktopModules\WWStore\Checkout.ascx.cs

Line700+

            int m_BillingAddressID = 0;
            int m_ShippingAddressID = 0;
                //BillingAddress.AddressID = m_BillingAddressID;

    //fred001 if (Null.IsNull(BillingAddress.AddressID) || BillingAddress.AddressID == -1)
    //fred001 {
    BillingAddress.PortalID = this.PortalId;
    BillingAddress.UserID = this.UserId;
                m_BillingAddressID = controller.AddAddress(BillingAddress);

    //fred001 }
                //fred001 else
    //fred001 {
     //fred001 controller.UpdateAddress(BillingAddress);
                //fred001 }

             //fred001 if (Null.IsNull(ShippingAddress.AddressID) || ShippingAddress.AddressID == -1)
                //fred001 {
                ShippingAddress.PortalID = this.PortalId;
                ShippingAddress.UserID = this.UserId;

                if (ShippingAddress.Address1.Length == 0)
                {
                    m_ShippingAddressID = controller.AddAddress(BillingAddress);
                }
                else
                {
                    m_ShippingAddressID = controller.AddAddress(ShippingAddress);
                }
             //fred001 }
            //fred001 else
                //fred001 {
                //fred001 controller.UpdateAddress(ShippingAddress);
             //fred001 } 

   //Now that the addresses are saved update the tax and shipping.

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I tested this code, works great except for one glitch. The "Region" field is not populated as selected value "combo" control, instead it gets populated with correct address "region" value in terms of a plain text field. Although no biggies, it would be great if we can fix this small glitch as well.

Sincerely,