There has been a right hoohah in the media and blogosphere about the "Race To Zero" contest being arranged for the next Defcon conference. In a nutshell, the "Race To Zero" organisers think it's a good idea to encourage people to create new malware variants in order to test anti-virus products.
The idea of running a virus-writing competition isn't a new one of course. In fact, they stretch back at least 15 years.
Read more in my article at Naked Security.