Next is a single aspx page that accepts the files.  The page handles user login, album creation/selection, and accepts multiple files in a single form post.  All the hard work is done by some javascript methods that handle the XML sent from Windows XP.  The javascript looks like this:

        <script language='javascript'>
            function startUpload()
            {
                var xml = window.external.Property("TransferManifest");
                var files = xml.selectNodes("transfermanifest/filelist/file");
                var albumId = document.getElementById("Album").value;

                for (i = 0; i < files.length; i++)
                {
                    var postTag = xml.createNode(1, "post", "");
                    postTag.setAttribute("href", "http://yoursite.net/XPPublish.aspx");
                    postTag.setAttribute("name", "userpicture");

                    var dataTag = xml.createNode(1, "formdata", "");
                    dataTag.setAttribute("name", "MAX_FILE_SIZE");
                    dataTag.text = "10000000";                    
                    postTag.appendChild(dataTag);
                    
                    var dataTag1 = xml.createNode(1, "formdata", "");
                    dataTag1.setAttribute("name", "btnUpload");
                    dataTag1.text = "Save";
                    postTag.appendChild(dataTag1);
                    
                    var dataTag2 = xml.createNode(1, "formdata", "");
                    dataTag2.setAttribute("name", "hidAlbumId");
                    dataTag2.text = albumId;
                    postTag.appendChild(dataTag2);

                    files.item(i).appendChild(postTag);
                }
                
                var uploadTag = xml.createNode(1, "uploadinfo", "");
                uploadTag.setAttribute("friendlyname", "Family Photo Gallery");
                var htmluiTag = xml.createNode(1, "htmlui", "");
                htmluiTag.text = "http://yoursite.net/Personal/Albums/Photos.aspx?AlbumID=" + albumId;
                uploadTag.appendChild(htmluiTag);

                xml.documentElement.appendChild(uploadTag);

                window.external.Property("TransferManifest") = xml;
                window.external.SetWizardButtons(true,true,true);
                document.getElementById("divContent").innerHtml = xml;
                window.external.FinalNext();
            }

            function OnBack()
            {
                window.external.FinalBack();
                window.external.SetWizardButtons(false,true,false);
            }

            function OnNext()
            {
                if (document.getElementById("divLogin"))
                {
                    document.getElementById("LoginArea_Login1_LoginButton").click();
                }
                else
                {
                    startUpload();
                }
            }

            function OnCancel()
            {
            }

            function window.onload()
            {
                window.external.SetHeaderText('Photo Gallery','Your Photos');
                window.external.SetWizardButtons(true,true,false);
            }
        </script>

In case you haven't seen the XP Publishing Wizard in action, check out these screenshots: