Some of the information came from source packages for various things (e.g. bluez, QT etc), some of it came from dev packages in the SDK, some of it came from wiki entries, mailing list messages and forum posts and some of it was just plain reverse engineered. Some of it came from dbus introspection.

As for the N9, no I dont intend to do that one because I dont own an N9 (which means I cant do what I did with the N900 and try out different calls to see if they work)