This week's Ask Jack, from the printed-paper Technoloogy section, is also available online.
You can send your questions and comments to Jack.Schofield@theguardian.com. Published letters will be edited for brevity, but please include full details with your query.
Meanwhile I'm still trying to come to terms with the fact that when posting to the Technology blog, the sofware default is Published, whereas on Ask Jack, the same software defaults to Unpublished. Which means posts aren't posted at all. Knot-in-the-hankie time....