Had an appearance on the Today Show with Karl and spoke about the software that can be loaded onto your smartphone that allows others to find out where you are and can even eavesdrop on your conversations you are having. I blogged about it yesterday.

Speaking to Steve Liebmann today about the Nokia N900, which the company is talking about as more of a mini computer than a handset, and why wouldn't they? It has a huge screen, qwerty keyboard and huge functionality, and it really is like a super mini PC. It's a little heavier than other smartphones, but still fits nicely into your pocket. It is also running linex, which is an open source operating system so if you know how to program software you can go in and change features so they suit your needs.

Had a few calls today, including one from Janette, whose husband has just had a pacemaker implanted. She was told that he could not use a mobile phone and wondered if there was any kind of solution. I'm not a doctor, so do not intend handing out advice on what a person with a pacemaker can and cannot do. There would be a couple of issues here – the radiation output of the handset and the frequencies, which might interfere with how the unit works. If radiation is a problem, you can go to a chart <a href="http://reviews.cnet.com/4520-6602_7-6258775-11.html" target="_blank">here</a> that informs you about the level of radiation in handsets. As for frequencies vis-a-vis pacemakers, I wouldn't dream of offering an opinion on such a thing when it comes to medical matters.

Martin was trying to find a video card upgrade. He bought an Acer Aspire that comes with a Quad 4 processor but came with a basic video card, and when he put in a PC game in the slot, it wasn't that powerful. Go to the AMD website (www.amd.com.au) and type in the processor you've got and it will tell you what cards will run on that processor.

Des lives on the south coast and can get analogue radio, and he was thinking of getting a digital radio but is concerned he will not be about to get the Sydney stations any more. In order to get a digital signal you will have to test any unit you buy in the shop – especially if you are in the Illawarra and hoping to get Sydney stations.

Alex queried about whether a television 3D experience would be the same as you would get at the movies with the likes of Avatar. The short answer is yes, it will be, albeit on a smaller scale. You will get a pair of 3D glasses (not the cheap cardboard kind) for about $150-$250 depending on the manufacturer, and you will watch movies through a 3D-enabled blu-ray player. Indications at the moment is that a 3D television will be about 20 to 30 percent more expensive than current models.

Finally, Steve received an email from a listener who said they had a $2.50 Apple app that allowed them to listen to the radio anywhere around the world – sounds like a very handy device to have on your smartphone.