Free our data!, P2P gets legal, Ajax's dark battles, BT's broadband upgrade, Mac hacking, techno MPs and much more

• Free our data: A Guardian Technology campaign begins today. Our taxes fund the collection of public data for maps, tides and weather - yet we are obliged to pay again to access it. Make the data freely available to stimulate innovation, argue Charles Arthur and Michael Cross.
• File sharing? It's great business
  Just months ago, the writing seemed to be on the wall for popular peer-to-peer technologies. How quickly things change. Bernhard Warner reports.
• Ajax prepares for battle on the dark side
  One of the newest web technologies has a sneaky power: it can access pages from your browser without you knowing about it. Quinn Norton reports.
• BT brings faster broadband for free - but it may cost you
  ISPs could decide to charge their customers extra for the faster services they will soon be able to provide. George Cole reports.
• Techno world has MPs beat
  Many MPs and peers still tend to log off from matters technological. Richard Sarson reports.
• Meet the ancestors - online
  Step changes in websites can happen almost unnoticed. Nowhere is this more true than in genealogy, says Victor Keegan.
• E-government's shy family member takes centre stage
  Michael Cross: Two years after posting a shop window on the web, HM Government has decided to start telling people about it.
• Technobile
  Less is so much more when it comes to games tutorials, camera angles and head-up displays, says Kate Bevan.
• Don't let Hollywood be the arbiter of games movies
  Last weekend, while the Fabulous got out their frocks and Jimmy Choos to prance up the red carpet, games movies were walking a different plank, says Aleks Krotoski.
• Games
  Toca Race Driver 3, Dungeons & Dragons Online: Stormreach and Marc Ecko's Getting Up: Contents Under Pressure
• Read this week's letters
  Send your letters, comments, questions and rants to tech@theguardian.com, and please include your address and post town.
• Ask Jack
  Send your questions and comments to Jack.Schofield@theguardian.com. Published letters will be edited for brevity, but include full details with your query. Please visit our
• Ask Jack weblog for daily updates.
• Newly asked questions:
  • When can I buy an HD DVD player?
    At the end of next month, but there's a catch ...
  • How does Google envisage the future?
    According to a presentation to analysts, as "a world with infinite storage, bandwidth and CPU power".
  • Can you hack into a Mac in 30 minutes?
    It depends. If you open enough of it up, then certainly.