This includes his entries from 10 August 2006 until 20 November 2006 (the day of his attack).
This is Bosse’s LiveJournal page. It includes entries from 2 September 2004 through 15 August 2005 (in reverse chronological order).
This is a translation from German of the content of Bosse’s website, consisting of his rant against the world.
This is a transcription of video Bosse made of himself ranting against the world (in English).