This is the book I wish I had known about BEFORE my trip!  It was only just published in Dec 2012 and we left on 28 Feb so had stopped looking around by then.  It’s well laid out with photos of all the birds you can expect to see in Indonesia with the bird’s habitat highlighted on a map.  Great planning tool, can also help with communicating with guides who don’t speak English.  I found it in a book shop in the Surabaya airport on my way back to Bali for around $35 but you can order it on Amazon (affiliate link) for $23 and have it to study in advance.