Salam pendekar!
A fairly concise and good introduction to the world of keris would be Edward Frey's The Kris:Msytic Weapon of the Malay World, published by Oxford Univ Press.
Fairly uncluttered language and facts, with a good selection of coloured pictures. Fairly available in all good bookstores so you might want to try Borders or the Kinokuniya at Takashimaya.
For something in Bahasa Indonesia, there's the Ensiklopedia Keris by almarhum Bambang Hasrinokusumo. I think it's available online or at most good stores in Jakarta.
