Our regular presenter, Adam Walton, was hit by a virus this week so Alan Daulby is standing in for him in this technology special.

Money talks

Is there money to be made in virtual worlds? That's the question we are asking in this week's Science Cafe as a Virtual Enterprise Conference comes to Wrexham. We'll hear from Welsh virtual entrepreneur Amy Louise Matthews whose answer is a resounding yes.

Buzz off

Our regular technology guru, Bill Thompson, join the programme to talk about Google Buzz, the newest social networking tool. There were a few bips at launch, but Bill tells us why he thinks Buzz isn't facing extinction yet.

Fat file

Dagfinn Bach, The Norwegian who helped create MP3 players back in 1993, joins Science Cafe to talk about his latest project - MusicDNA. It's a new-generation MP3 file, offering lots of other content which can be updated after the initial download.

Heart health

Heart disease is the biggest killer in the UK and yet many people simply don't know that they are at risk from it. Cardiff University's Department of Care and Public Health have set up a website with a risk calculator, which should help with research.

If you want to take part in the survey, click here to access My Heart Risk.