One of my biggest interests is computer security and exploitation techniques.
I have created some wargames which you can find here and I created the software for running the first danish Capture The Flag contest. This software is now open sourced and can be found at Sourceforge at http://sourceforge.net/projects/ctfd/.
Also I like solving crackmes. I find most of them at Crackmes.de. I document my solutions and progress here at this site.
I have done talks about web exploitation techniques. You can download the software and a PDF of my presentation (in Danish) here: ProsaWebSecurity.zip
Here are some of my favorite security related links: