An 18-year-old guy in Germany was arrested as being the author of all versions of the Sasser worm. Here’s a story on it:
http://news.bbc.co.uk/1/hi/world/europe/3695857.stm
(Sorry, but TinyURL is having problems with their PHP script right now, so I can’t make an easier link)
The reports also say that this guy just might be responsible for the Netsky e-mail viruses. They are saying that either this guy is the “SkyNet” group making all the NetSky virus versions, or he is a member of SkyNet. Either way, that’s really interesting, I think.