Who's tracking you?, Slingbox chief interviewed, the next target for spam, Sony's laser blues and much more

This week's print edition of the Technology supplement is online too..

• Follow you, follow me
  GPS tracking can be used to stay in touch with friends, or more sinister purposes such as spying on a spouse. Ronan Fitzgerald examines the potential for abuse.
• Free Our Data: National Archives squares the data circle
  Burgeoning demand for public sector information has prompted controversial cost-cutting measures, but might the model for digitising old censuses be a good one for government data?
• Is the end in sight for Sony's laser blues?
  Sony's announcement last week of delays to the PlayStation 3 (PS3) in Europe was blamed solely on the difficulties in making one component: the blue laser diode for the built-in Blu-ray player.
• Gadgets:
  • Samsung YP-K5
    Samsung breaks new ground in the MP3 player market with the launch this week of the K5.
  • Virgin Lobster 700TV
    While you have been able to watch TV on a mobile for over a year now, the method of streaming the video, over 3G networks, is far from satisfactory. With the Lobster 700TV, Virgin offers a solution.
  • Ion USB turntable
    There are many ways to transfer audio from vinyl records to PCs, but for the most part they are complex and not very effective. The Ion USB turntable, priced at £120, raises the bar a little.
• Unlike Tony, Sony has the cool to slip the gallows
  Keith Stuart: Surely I was not alone last week in spotting the parallels between the collapsing Tony Blair premiership and Sony's PS3 delay.
• What is the next target for spam?
  Social media sites such as Digg and Reddit.
• How can I be sure who someone is in Second Life?
  You can't - and it's even more complicated now, because hackers broke into the system's database and stole a number of peoples' passwords and potentially other details such as names and addresses.
• Lightening the load for digital nomads
  Victor Keegan: The information revolution made it easier to work from home, but a new kind of person is now emerging who spurns both the office and the home in order to work on the move in a library, a hotel, a Starbucks with a wireless link, an internet cafe, or a park bench.
• Technobile
  Andrew Brown: Since we end up paying for the printer cartridges rather than the printers, why not review those instead?
• Sling your telly around the world
  Blake Krikorian is chief executive of Sling Media, which makes the Slingbox - a device that takes a TV input and then sends it over any network, whether it's in your home or to the other side of the globe.
  Note: the full text of this interview will be posted on the blog later today
• Do robots dream of copyright?
  Dead author Philip K Dick lives on, in the form of an automaton. But might it infringe property rights?
• Energy stressed? Take some silicon and lap up the sun
  Charles Arthur: It was only last year that the use of silicon for solar cells outdistanced - or perhaps "outarea-d" - that for semiconductors. Whichever way you look at it, that's remarkable.
• Ask Jack
  Send your questions and comments to Jack.Schofield@guardian.co.uk. Published letters will be edited for brevity, but include full details with your query. Please visit our Ask Jack weblog for daily updates.
• Letters and blogs
  Send your letters, comments, questions and rants to tech@guardian.co.uk, and please include your address and post town.
• Newsbytes
  Pearl of a phone | Tried Tri-call? | A nation surfs | Digital TV tested | TalkTalk Hell | Staying safe online | It's a digital world