This annual non-profit 4-day festival of music and culture is definitely worth a visit. The 2007 Festival will take place from July 5th to July 8th. Unfortunately, it is still unclear if I will have the time to be there.
See web address www.roskilde-festival.dk for more information. Ticket sales have not started yet.
Here is my report on the festival 2005.
Option for ordering tickets:
www.eventim.de