Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

uses
   ActiveX;

 function WB_SaveHTMLCode(WebBrowser: TWebBrowser; const FileName: TFileName): Boolean;
 var
   ps: IPersistStreamInit;
   fs: TFileStream;
   sa: IStream;
 begin
   ps := WebBrowser.Document as IPersistStreamInit;
   fs := TFileStream.Create(FileName, fmCreate);
   try
     sa := TStreamAdapter.Create(fs, soReference) as IStream;
     Result := Succeeded(ps.Save(sa, True));
   finally
     fs.Free;
   end;
 end;

 function WB_GetHTMLCode(WebBrowser: TWebBrowser; ACode: TStrings): Boolean;
 var
   ps: IPersistStreamInit;
   ss: TStringStream;
   sa: IStream;
   s: string;
 begin
   ps := WebBrowser.Document as IPersistStreamInit;
   s := '';
   ss := TStringStream.Create(s);
   try
     sa := TStreamAdapter.Create(ss, soReference) as IStream;
     Result := Succeeded(ps.Save(sa, True));
     if Result then ACode.Add(ss.Datastring);
   finally
     ss.Free;
   end;
 end;

 procedure TForm1.Button1Click(Sender: TObject);
 begin
   WB_SaveHTMLCode(Webbrowser1, 'c:\test.txt');
 end;

 procedure TForm1.Button2Click(Sender: TObject);
 begin
   WB_GetHTMLCode(Webbrowser1, Memo1.Lines);
 end;