For more background information about the shakuhachi, its history, making, different schools, etc, here are some links:

The International Shakuhachi Society: www.komuso.com

The European Shakuhachi Society: www.shakuhachisociety.eu

Shakuhachi Resources: www.shakuhachi.wikidot.com

Komuso Blog: Komuso Khronicles

Shakuhachi Store and Workshop: Tai Hei Shakuhachi