These are some website / blogs that writes / talks about gamelan all over the world. So if u want to know more u can always go here...enjoy!!

http://en.wikipedia.org/wiki/Gamelan
http://gamelanuiam.blogspot.com/
http://www.musicmall-asia.com/malaysia/classical/gamelan.html
http://www.seasite.niu.edu/Indonesian/Budaya_Bangsa/Gamelan/Main_Page/main_page.htm